Fix libksquirrel FTBFS caused by incorrect linker settings when using libtool ... --tag=CC ...

git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/libraries/libksquirrel@1232647 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

kernel/kls_png/ksquirrel-libs-png/Makefile.am

@@ -2,7 +2,7 @@ INCLUDES = -I.
 
 lib_LTLIBRARIES = libksquirrel-libs-png.la
 
-libksquirrel_libs_png_la_SOURCES = png.c pngconf.h pngerror.c pnggccrd.c pngget.c png.h pngmem.c pngpread.c pngread.c pngrio.c pngrtran.c \
+libksquirrel_libs_png_la_SOURCES = png.cpp pngconf.h pngerror.c pnggccrd.c pngget.c png.h pngmem.c pngpread.c pngread.c pngrio.c pngrtran.c \
 pngrutil.c pngset.c pngtrans.c pngvcrd.c pngwio.c pngwrite.c pngwtran.c pngwutil.c pnghack.h
 
 libksquirrel_libs_png_la_LIBADD = -lz -lm