inkscape: remove unused patch

pkgs/applications/graphics/inkscape/libpng-1.5.patch

@@ -1,47 +0,0 @@
-Source: upstream revisions 10061 and 10707
-
---- a/src/sp-image.cpp	2011-02-21 07:59:34 +0000
-+++ b/src/sp-image.cpp	2011-02-21 08:57:28 +0000
-@@ -387,9 +387,13 @@
- 
- #if defined(PNG_iCCP_SUPPORTED)
-                 {
--                    char* name = 0;
-+                    png_charp name = 0;
-                     int compression_type = 0;
--                    char* profile = 0;
-+#if (PNG_LIBPNG_VER < 10500)
-+                    png_charp profile = 0;
-+#else
-+                    png_bytep profile = 0;
-+#endif
-                     png_uint_32 proflen = 0;
-                     if ( png_get_iCCP(pngPtr, infoPtr, &name, &compression_type, &profile, &proflen) ) {
- //                                         g_message("Found an iCCP chunk named [%s] with %d bytes and comp %d", name, proflen, compression_type);
-
---- a/src/extension/internal/pdfinput/svg-builder.cpp	2011-10-27 04:55:51 +0000
-+++ b/src/extension/internal/pdfinput/svg-builder.cpp	2011-10-29 20:34:00 +0000
-@@ -1481,7 +1481,7 @@
-         return NULL;
-     }
-     // Set error handler
--    if (setjmp(png_ptr->jmpbuf)) {
-+    if (setjmp(png_jmpbuf(png_ptr))) {
-         png_destroy_write_struct(&png_ptr, &info_ptr);
-         return NULL;
-     }
-
---- a/src/helper/png-write.cpp	2011-08-07 10:53:12 +0000
-+++ b/src/helper/png-write.cpp	2011-10-29 20:34:00 +0000
-@@ -166,8 +166,8 @@
-     /* Set error handling.  REQUIRED if you aren't supplying your own
-      * error hadnling functions in the png_create_write_struct() call.
-      */
--    if (setjmp(png_ptr->jmpbuf)) {
--        /* If we get here, we had a problem reading the file */
-+    if (setjmp(png_jmpbuf(png_ptr))) {
-+        // If we get here, we had a problem reading the file
-         fclose(fp);
-         png_destroy_write_struct(&png_ptr, &info_ptr);
-         return false;
-