Allow building with Externals/wxWidgets3 on Linux and import

libpng so it can be maintained independently of wxWidgets.


git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@7172 8ced0084-cf51-0410-be5f-012b33b47a6e

Externals/libpng/SConscript

@@ -0,0 +1,29 @@
+# -*- python -*-
+
+Import('env')
+import sys
+
+if env.has_key('shared_libpng') and env['shared_libpng']:
+	env['LIBS'] += 'png'
+	Return()
+
+files = [
+	'png.c',
+	'pngerror.c',
+	'pngget.c',
+	'pngmem.c',
+	'pngpread.c',
+	'pngread.c',
+	'pngrio.c',
+	'pngrtran.c',
+	'pngrutil.c',
+	'pngset.c',
+	'pngtrans.c',
+	'pngwio.c',
+	'pngwrite.c',
+	'pngwtran.c',
+	'pngwutil.c',
+	]
+
+env['CPPPATH'] += ['#Externals/libpng']
+env['LIBS'] += env.StaticObject(files)