File mtpaint-3.50-libpng-fix.patch of Package mtpaint

--- mtpaint-3.50/src/png.c.orig	2025-09-25 23:44:00.000000000 +0000
+++ mtpaint-3.50/src/png.c	2025-09-25 23:44:00.000000000 +0000
@@ -635,7 +635,7 @@
 	return (i | 0x8000);
 }
 
-static int buggy_libpng_handler()
+static int buggy_libpng_handler(png_structp png_ptr, png_unknown_chunkp chunk)
 {
 	/* Ignore it */
 	return (1);
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