Temporary fix: AppImages - Wayland

The linuxdeploy gtk plugin sets the default to X11, with the comment
that using Wayland causes a crash - although this comment was made some
years ago

Limited local testing under Wayland does not show a problem.

The relevant line is patched out before the AppImage is created. The
backend therefore defaults to whatever is being used.

Author: caclark

.github/workflows/appimage-aarch64.yml

@@ -65,6 +65,7 @@ jobs:
             chmod +x tools/linuxdeploy-aarch64.AppImage
             wget https://raw.githubusercontent.com/linuxdeploy/linuxdeploy-plugin-gtk/master/linuxdeploy-plugin-gtk.sh
             chmod +x linuxdeploy-plugin-gtk.sh
+            sed -i '/GDK_BACKEND/d' linuxdeploy-plugin-gtk.sh
             tools/linuxdeploy-aarch64.AppImage \
               --desktop-file $GITHUB_WORKSPACE/AppDir/usr/share/applications/org.geeqie.Geeqie.desktop \
               --icon-file $GITHUB_WORKSPACE/AppDir/usr/share/pixmaps/geeqie.png \

.github/workflows/appimage-minimal-aarch64.yml

@@ -68,6 +68,7 @@ jobs:
             wget https://github.com/linuxdeploy/linuxdeploy/releases/download/continuous/linuxdeploy-aarch64.AppImage \
               -O tools/linuxdeploy-aarch64.AppImage
             chmod +x tools/linuxdeploy-aarch64.AppImage
+            sed -i '/GDK_BACKEND/d' linuxdeploy-plugin-gtk.sh
             wget https://raw.githubusercontent.com/linuxdeploy/linuxdeploy-plugin-gtk/master/linuxdeploy-plugin-gtk.sh
             chmod +x linuxdeploy-plugin-gtk.sh
             tools/linuxdeploy-aarch64.AppImage \

.github/workflows/appimage-minimal-x86_64.yml

@@ -81,6 +81,7 @@ jobs:
           chmod +x linuxdeploy-x86_64.AppImage
           wget https://raw.githubusercontent.com/linuxdeploy/linuxdeploy-plugin-gtk/master/linuxdeploy-plugin-gtk.sh
           chmod +x linuxdeploy-plugin-gtk.sh
+          sed -i '/GDK_BACKEND/d' linuxdeploy-plugin-gtk.sh
 
       - name: Build AppImage
         run: |

.github/workflows/appimage-x86_64.yml

@@ -77,6 +77,7 @@ jobs:
           chmod +x linuxdeploy-x86_64.AppImage
           wget https://raw.githubusercontent.com/linuxdeploy/linuxdeploy-plugin-gtk/master/linuxdeploy-plugin-gtk.sh
           chmod +x linuxdeploy-plugin-gtk.sh
+          sed -i '/GDK_BACKEND/d' linuxdeploy-plugin-gtk.sh
 
       - name: Build AppImage
         run: |