Update GM to 1.3.35 and patch handling of PNG images

Adapting the patch from https://sourceforge.net/p/graphicsmagick/code/ci/50395430a37188d0d197e71bd85ed6dd0f649ee3/

changelogs/unreleased/security-graphicsmagick-update-master.yml

+---
+title: Update GraphicsMagick to 1.3.35 and patch PNG vulnerability
+merge_request:
+author:
+type: security

config/patches/graphicsmagick/png-vulnerability-fix.patch

+Patch adapted from https://sourceforge.net/p/graphicsmagick/code/ci/50395430a37188d0d197e71bd85ed6dd0f649ee3/.
+
+diff --git a/coders/png.c b/coders/png.c
+index 60ce8dc..5878e60 100644
+--- a/coders/png.c
++++ b/coders/png.c
+@@ -5304,7 +5304,7 @@ static Image *ReadMNGImage(const ImageInfo *image_info,
+               if (logging)
+                 (void) LogMagickEvent(CoderEvent,GetMagickModule(),
+                                       "MAGN chunk (%lu bytes): "
+-                                      "First_magnified_object_id=%u, Last_magnified_object_id=%u, "
++                                      "First_magnified_object_id=%u, Las t_magnified_object_id=%u, "
+                                       "MB=%u, ML=%u, MR=%u, MT=%u, MX=%u, MY=%u, "
+                                       "X_method=%u, Y_method=%u",
+                                       length,
+@@ -5679,6 +5679,8 @@ static Image *ReadMNGImage(const ImageInfo *image_info,
+           /*
+             If magnifying and a supported method is requested then
+             magnify the image.
++
++            http://www.libpng.org/pub/mng/spec/mng-1.0-20010209-pdg.html#mng-MAGN
+           */
+           if (((mng_info->magn_methx > 0) && (mng_info->magn_methx <= 5)) &&
+               ((mng_info->magn_methy > 0) && (mng_info->magn_methy <= 5)))
+@@ -5689,7 +5691,28 @@ static Image *ReadMNGImage(const ImageInfo *image_info,
+ 
+               if (logging)
+                 (void) LogMagickEvent(CoderEvent,GetMagickModule(),
+-                                      "  Processing MNG MAGN chunk");
++                                      "  Processing MNG MAGN chunk: MB=%u, ML=%u,"
++                                      " MR=%u, MT=%u, MX=%u, MY=%u,"
++                                      " X_method=%u, Y_method=%u",
++                                      mng_info->magn_mb,mng_info->magn_ml,
++                                      mng_info->magn_mr,mng_info->magn_mt,
++                                      mng_info->magn_mx,mng_info->magn_my,
++                                      mng_info->magn_methx,
++                                      mng_info->magn_methy);
++
++              /*
++                If the image width is 1, then X magnification is done
++                by simple pixel replication.
++              */
++              if (image->columns == 1)
++                  mng_info->magn_methx = 1;
++
++              /*
++                If the image height is 1, then Y magnification is done
++                by simple pixel replication.
++              */
++              if (image->rows == 1)
++                  mng_info->magn_methy = 1;
+ 
+               if (mng_info->magn_methx == 1)
+                 {
+@@ -5734,12 +5757,10 @@ static Image *ReadMNGImage(const ImageInfo *image_info,
+                   Image
+                     *large_image;
+ 
+-                  int
+-                    yy;
+-
+                   long
+                     m,
+-                    y;
++                    y,
++                    yy;
+ 
+                   register long
+                     x;

config/software/graphicsmagick.rb

@@ -15,7 +15,7 @@
 #
 name 'graphicsmagick'
-default_version '1.3.34'
+default_version '1.3.35'
 license 'MIT'
 license_file 'Copyright.txt'
@@ -28,13 +28,15 @@ dependency 'libtiff'
 dependency 'zlib'
 source url: "https://ftp.icm.edu.pl/pub/unix/graphics/GraphicsMagick/1.3/GraphicsMagick-#{version}.tar.gz",
-       sha256: '4717f7a32d964c515d83706fd52d34e089c2ffa35f8fbf43c923ce19343cf2f4'
+       sha256: 'd96d5ce2ef7e0e90166551e38742713728bfd33d6f18495a9ddda938700fc055'
 relative_path "GraphicsMagick-#{version}"
 build do
   env = with_standard_compiler_flags(with_embedded_path)
+  patch source: "png-vulnerability-fix.patch"
+
   configure_command = [
     './configure',
     "--prefix=#{install_dir}/embedded",