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Make build glue accept libpng 1.6.x and don't hardcode suffix

One hunk in src/CMakeLists.txt was added to fix target generation with ninja.

--- CMakeLists.txt.orig 2017-05-27 09:58:05 UTC
+++ CMakeLists.txt
@@ -582,9 +582,10 @@ else()
    set(LIBZIP_LIBRARY libzip)
 endif()
 
-# FindPNG does a few things we don't want. So do it ourselves. Fixed to libpng17
-find_path(PNG_PNG_INCLUDE_DIR NAMES "libpng17/png.h")
-find_library(PNG_LIBRARY NAMES png17 libpng17)
+find_package(PkgConfig)
+pkg_check_modules(PNG libpng>=1.6)
+set(PNG_LIBRARY ${PNG_LIBRARIES})
+set(PNG_PNG_INCLUDE_DIR ${PNG_INCLUDE_DIRS})
 find_package(PackageHandleStandardArgs)
 find_package_handle_standard_args(PNG REQUIRED_VARS PNG_LIBRARY PNG_PNG_INCLUDE_DIR)
 if (PNG_FOUND)
@@ -1618,12 +1619,11 @@ endif()
 
 setup_target_project(${CoreLibName} Core)
 
-# Generate git-version.cpp at build time.
-add_custom_target(GitVersion ALL
-   DEPENDS something_that_never_exists)
-add_custom_command(OUTPUT something_that_never_exists
+add_custom_command(OUTPUT ${CMAKE_CURRENT_SOURCE_DIR}/git-version.cpp
    COMMAND ${CMAKE_COMMAND} -DSOURCE_DIR=${CMAKE_CURRENT_SOURCE_DIR}
        -P ${CMAKE_CURRENT_SOURCE_DIR}/git-version.cmake)
+# Generate git-version.cpp at build time.
+add_custom_target(GitVersion DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/git-version.cpp)
 
 set_source_files_properties(${CMAKE_CURRENT_SOURCE_DIR}/git-version.cpp
    PROPERTIES GENERATED TRUE)
--- Core/Screenshot.cpp.orig    2017-05-27 09:58:05 UTC
+++ Core/Screenshot.cpp
@@ -21,7 +21,7 @@
 #ifdef USING_QT_UI
 #include <QtGui/QImage>
 #else
-#include <libpng17/png.h>
+#include "png.h"
 #include "ext/jpge/jpge.h"
 #endif
 
--- ext/native/image/png_load.cpp.orig  2017-05-27 09:58:05 UTC
+++ ext/native/image/png_load.cpp
@@ -5,7 +5,7 @@
 #ifdef USING_QT_UI
 #include <QtGui/QImage>
 #else
-#include "libpng17/png.h"
+#include "png.h"
 #endif
 
 #include "png_load.h"
--- Core/TextureReplacer.cpp.orig   2017-05-27 09:58:05 UTC
+++ Core/TextureReplacer.cpp
@@ -16,7 +16,7 @@
 // https://github.com/hrydgard/ppsspp and http://www.ppsspp.org/.
 
 #ifndef USING_QT_UI
-#include <libpng17/png.h>
+#include "png.h"
 #endif
 
 #include <algorithm>