[libpng15] Imported from libpng-1.5.8beta01.tar

pngtest.c

@@ -1817,4 +1817,4 @@ main(int argc, char *argv[])
 }
 
 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef png_libpng_version_1_5_7 Your_png_h_is_not_version_1_5_7;
+typedef png_libpng_version_1_5_8beta01 Your_png_h_is_not_version_1_5_8beta01;