games/zsnes: Patched SlackBuild.

Fixes build failure with libpng16 on -current.

Signed-off-by: David Spencer <baildon.research@googlemail.com>

games/zsnes/zsnes-1.51-libpng15.patch

@@ -0,0 +1,12 @@
+Use existing png_set_IHDR() and stop accessing PNG structure members directly
+
+--- src/zip/zpng.c
++++ src/zip/zpng.c
+@@ -129,7 +129,6 @@
+         png_set_IHDR(png_ptr, info_ptr, width, height, 8,
+                      PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE,
+                      PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
+-        info_ptr->color_type = PNG_COLOR_TYPE_RGB;
+ 
+         //Allocate an array of scanline pointers
+         row_pointers = (png_bytep*)malloc(height*sizeof(png_bytep));

games/zsnes/zsnes.SlackBuild

@@ -64,9 +64,6 @@ mv $PRGNAM$ZSNESDIR $PRGNAM-$VERSION
 mv $PRGNAM-$VERSION/src/* $PRGNAM-$VERSION
 cd $PRGNAM-$VERSION
 
-# GCC 4.7 fixes from Debian
-cat $CWD/0012-Fix-build-with-gcc-4.7.patch | patch -p2 --verbose
-
 chown -R root:root .
 find -L . \
  \( -perm 777 -o -perm 775 -o -perm 750 -o -perm 711 -o -perm 555 -o -perm 511 \) \
@@ -74,6 +71,13 @@ find -L . \
  \( -perm 666 -o -perm 664 -o -perm 600 -o -perm 444 -o -perm 440 -o -perm 400 \) \
  -exec chmod 644 {} \;
 
+# GCC 4.7 fixes from Debian
+cat $CWD/0012-Fix-build-with-gcc-4.7.patch | patch -p2 --verbose
+
+# Fix for libpng16 (thanks to Arch Linux)
+# https://projects.archlinux.org/svntogit/community.git/plain/trunk/zsnes-1.51-libpng15.patch?h=packages/zsnes
+patch -p1 < $CWD/zsnes-1.51-libpng15.patch
+
 CFLAGS="$SLKCFLAGS" \
 CXXFLAGS="$SLKCFLAGS" \
 force_arch="$ARCH" \