chore: bump gmic to v3.3.4

This also comes with a patch to ensure the build succeeds,
which I suspect can be dropped after the next release of
gmic.

snap/local/patches/gmic-gimp-image-procedure-new-cast.patch

@@ -0,0 +1,13 @@
+diff --git a/src/Host/Gimp/host_gimp.cpp b/src/Host/Gimp/host_gimp.cpp
+index 166ff0c..86888d4 100644
+--- a/src/Host/Gimp/host_gimp.cpp
++++ b/src/Host/Gimp/host_gimp.cpp
+@@ -1205,7 +1205,7 @@ static GimpProcedure * gmic_qt_create_procedure(GimpPlugIn * plug_in, const gcha
+   GimpProcedure * procedure = NULL;
+
+   if (strcmp(name, PLUG_IN_PROC) == 0) {
+-    procedure = gimp_image_procedure_new(plug_in, name, GIMP_PDB_PROC_TYPE_PLUGIN, gmic_qt_run, NULL, NULL);
++    procedure = gimp_image_procedure_new(plug_in, name, GIMP_PDB_PROC_TYPE_PLUGIN, (GimpRunImageFunc) gmic_qt_run, NULL, NULL);
+
+     gimp_procedure_set_image_types(procedure, "RGB*, GRAY*");
+

snap/snapcraft.yaml

@@ -561,7 +561,7 @@ parts:
     after: [gimp]
     plugin: nil
     override-pull: |
-      VERSION=v.3.3.3
+      VERSION=v.3.3.4
       git clone -b "$VERSION" https://github.com/GreycLab/gmic.git
       git clone -b "$VERSION" https://github.com/GreycLab/CImg.git
       git clone -b "$VERSION" https://github.com/c-koi/gmic-qt.git
@@ -571,6 +571,11 @@ parts:
       # the build phase, by the time we get there the proxy token has
       # expired - so force it to happen here.
       wget -qO gmic/src/gmic_stdlib_community.h "https://gmic.eu/gmic_stdlib_community$(echo "${VERSION}" | tr -d "v.").h"
+
+      # TODO: This can potentially be dropped after the next release of gmic-qt
+      pushd gmic-qt
+      patch -Np1 -i $CRAFT_PROJECT_DIR/snap/local/patches/gmic-gimp-image-procedure-new-cast.patch
+      popd
     build-environment:
       - LD_LIBRARY_PATH: $CRAFT_STAGE/usr/lib:$CRAFT_STAGE/usr/lib/$CRAFT_ARCH_TRIPLET_BUILD_FOR
       - PATH: /snap/bin:$PATH