File atkmm-2.36.1-fix-no-png-dot-format.patch of Package mingw64-atkmm

--- atkmm-2.36.1.orig/doc/reference/Doxyfile.in	2021-05-21 11:29:38.164167200 +0200
+++ atkmm-2.36.1/doc/reference/Doxyfile.in	2022-03-24 08:59:28.811945653 +0100
@@ -332,7 +332,7 @@
 CALLER_GRAPH           = NO
 GRAPHICAL_HIERARCHY    = YES
 DIRECTORY_GRAPH        = NO
-DOT_IMAGE_FORMAT       = png
+DOT_IMAGE_FORMAT       = svg
 INTERACTIVE_SVG        = NO
 DOT_PATH               =
 DOTFILE_DIRS           =