Fix build of audio/kwave on -CURRENT (or with clang 9 in general).

There's a long description in the patch just added, but the error
looks something like this:

/tmp/v.cpp:1:27: note: constrained by private inheritance here
class foo {}; class bar : private foo {}; class baz : public bar { publi...

No PORTREVISION because it's no change for everyone except clang 9
users, who couldn't compile it previously.

Reported by:	fallout

1 files changed, 127 insertions, 0 deletions

diff --git a/audio/kwave/files/patch-private b/audio/kwave/files/patch-private
new file mode 100644
index 000000000000..715094f18db0
--- /dev/null
+++ b/audio/kwave/files/patch-private
@@ -0,0 +1,127 @@
+commit cb13b7153452060d919603d31ad4db94b3056f35
+Author: Adriaan de Groot <groot@kde.org>
+Date:   Sat Oct 12 20:41:30 2019 +0200
+
+    Private inheritance hides base-class names.
+    
+    Summary:
+    Kwave fails to compile with clang 9.0, with this kind of error message:
+    
+    ===
+    In file included from /wrkdirs/usr/ports/audio/kwave/work/kwave-19.08.1/libkwave/undo/UndoDeleteAction.cpp:24:
+    /wrkdirs/usr/ports/audio/kwave/work/kwave-19.08.1/libkwave/MultiTrackReader.h:61:24: error: 'QList' is a private member of 'QList<Kwave::SampleReader *>'
+                            const QList<unsigned int> &track_list,
+                                  ^
+    /wrkdirs/usr/ports/audio/kwave/work/kwave-19.08.1/libkwave/MultiTrackSource.h:41:36: note: constrained by private inheritance here
+                                              private QList<SOURCE *>
+                                              ^~~~~~~~~~~~~~~~~~~~~~~
+    /usr/local/include/qt5/QtCore/qlist.h:127:7: note: member is declared here
+    class QList
+          ^
+    1 error generated.
+    ===
+    
+    This can be demonstrated much more shortly with this code:
+    
+    ===
+    class foo {};
+    class bar : private foo {};
+    class baz : public bar
+    {
+        public:
+            foo m_foo;
+    };
+    ===
+    
+    Within baz, foo is looked up in bar, and then (because it's *private*
+    inheritance) afterwards access-control kicks in and disallows its use.
+    By fully-qualifying foo (or, in Kwave's case, QList) the name-lookup
+    happens differently, and the public (global) name is found.
+    
+    There is also a description of the problem on StackOverflow,
+    https://stackoverflow.com/questions/41595208/accessing-the-name-of-a-private-inherited-class-from-a-subclass
+    
+    Test Plan:
+    - still compiles
+    - packaging on FreeBSD-CURRENT, with clang 9, works again
+    
+    Differential Revision: https://reviews.freebsd.org/D22002
+diff --git libkwave/MultiTrackReader.cpp libkwave/MultiTrackReader.cpp
+index aedce6bb..0053d980 100644
+--- libkwave/MultiTrackReader.cpp
++++ libkwave/MultiTrackReader.cpp
+@@ -32,7 +32,7 @@ Kwave::MultiTrackReader::MultiTrackReader()
+ //***************************************************************************
+ Kwave::MultiTrackReader::MultiTrackReader(Kwave::ReaderMode mode,
+                                           Kwave::SignalManager &signal_manager,
+-                                          const QList<unsigned int> &track_list,
++                                          const ::QList<unsigned int> &track_list,
+                                           sample_index_t first,
+                                           sample_index_t last)
+     :Kwave::MultiTrackSource<Kwave::SampleReader, false>(0),
+diff --git libkwave/MultiTrackReader.h libkwave/MultiTrackReader.h
+index 5de02956..1d08c296 100644
+--- libkwave/MultiTrackReader.h
++++ libkwave/MultiTrackReader.h
+@@ -58,7 +58,7 @@ namespace Kwave
+ 	 */
+ 	MultiTrackReader(Kwave::ReaderMode mode,
+ 	                Kwave::SignalManager &signal_manager,
+-	                const QList<unsigned int> &track_list,
++	                const ::QList<unsigned int> &track_list,
+ 	                sample_index_t first, sample_index_t last);
+ 
+ 	/** Destructor */
+diff --git libkwave/MultiTrackWriter.cpp libkwave/MultiTrackWriter.cpp
+index e875f445..6c6b662a 100644
+--- libkwave/MultiTrackWriter.cpp
++++ libkwave/MultiTrackWriter.cpp
+@@ -35,7 +35,7 @@ Kwave::MultiTrackWriter::MultiTrackWriter()
+ 
+ //***************************************************************************
+ Kwave::MultiTrackWriter::MultiTrackWriter(Kwave::SignalManager &signal_manager,
+-                                          const QList<unsigned int> &track_list,
++                                          const ::QList<unsigned int> &track_list,
+                                           Kwave::InsertMode mode,
+                                           sample_index_t left,
+                                           sample_index_t right)
+@@ -52,7 +52,7 @@ Kwave::MultiTrackWriter::MultiTrackWriter(Kwave::SignalManager &signal_manager,
+                                           Kwave::InsertMode mode)
+     :Kwave::MultiWriter()
+ {
+-    QList<unsigned int> track_list = signal_manager.selectedTracks();
++    ::QList<unsigned int> track_list = signal_manager.selectedTracks();
+     sample_index_t left = 0;
+     sample_index_t right = 0;
+ 
+@@ -82,7 +82,7 @@ Kwave::MultiTrackWriter::~MultiTrackWriter()
+ 
+ //***************************************************************************
+ bool Kwave::MultiTrackWriter::init(Kwave::SignalManager &signal_manager,
+-                                   const QList<unsigned int> &track_list,
++                                   const ::QList<unsigned int> &track_list,
+                                    Kwave::InsertMode mode,
+                                    sample_index_t left,
+                                    sample_index_t right)
+diff --git libkwave/MultiTrackWriter.h libkwave/MultiTrackWriter.h
+index df3c3086..d809680e 100644
+--- libkwave/MultiTrackWriter.h
++++ libkwave/MultiTrackWriter.h
+@@ -55,7 +55,7 @@ namespace Kwave
+ 	 * @param right index of the last sample
+ 	 */
+ 	MultiTrackWriter(Kwave::SignalManager &signal_manager,
+-	                 const QList<unsigned int> &track_list,
++	                 const ::QList<unsigned int> &track_list,
+ 	                 Kwave::InsertMode mode,
+ 	                 sample_index_t left, sample_index_t right);
+ 
+@@ -86,7 +86,7 @@ namespace Kwave
+ 	 * @internal
+ 	 */
+ 	bool init(Kwave::SignalManager &signal_manager,
+-	          const QList<unsigned int> &track_list,
++	          const ::QList<unsigned int> &track_list,
+ 	          Kwave::InsertMode mode,
+ 	          sample_index_t left, sample_index_t right);
+