devel/librolegen: Fix build with Clang 6

Configured/src/rolegen.cpp:54:10: error: no viable conversion from returned value of type 'std::__1::ifstream' (aka 'basic_ifstream<char>') to function return type 'bool'
  return ifile;
         ^~~~~

http://beefy11.nyi.freebsd.org/data/head-i386-default/p478276_s338342/logs/errors/librolegen-1.0b.log

1 files changed, 15 insertions, 0 deletions

diff --git a/devel/librolegen/files/patch-src_rolegen.cpp.in b/devel/librolegen/files/patch-src_rolegen.cpp.in
new file mode 100644
index 000000000000..c35c9b2099da
--- /dev/null
+++ b/devel/librolegen/files/patch-src_rolegen.cpp.in
@@ -0,0 +1,15 @@
+Configured/src/rolegen.cpp:54:10: error: no viable conversion from returned value of type 'std::__1::ifstream' (aka 'basic_ifstream<char>') to function return type 'bool'
+  return ifile;
+         ^~~~~
+
+--- src/rolegen.cpp.in.orig	2018-09-01 02:53:02 UTC
++++ src/rolegen.cpp.in
+@@ -51,7 +51,7 @@ static bool isPrivilegedAppId(const char *appId)
+ static bool fexists(string filename)
+ {
+   ifstream ifile(filename.c_str());
+-  return ifile;
++  return ifile.is_open();
+ }
+ 
+ static void checkDirStructure()