Fix problems with extracted AppImage

Problems reported with linuxdeploy AppImages are:
linuxdeploy/linuxdeploy#303
linuxdeploy/linuxdeploy#304

This patch is a temporary workaround.

Author: caclark

scripts/geeqie-download-appimage.sh

@@ -330,4 +330,13 @@ then
 	else
 		ln --symbolic --force "Geeqie$minimal-latest-$architecture.AppImage" geeqie
 	fi
+
+	# Fix problems in linuxdeploy
+	# https://github.com/linuxdeploy/linuxdeploy/issues/303
+	# https://github.com/linuxdeploy/linuxdeploy/issues/304
+	# shellcheck disable=SC2016
+	sed -i '/^this_dir/ c\this_dir=$(dirname "$(readlink -f "$BASH_SOURCE")")' "./Geeqie$minimal-latest-$architecture-AppImage/squashfs-root/AppRun"
+
+	# shellcheck disable=SC2016
+	sed -i '/^exec/ c\exec $(readlink -f $this_dir/AppRun.wrapped) "$@"' "./Geeqie$minimal-latest-$architecture-AppImage/squashfs-root/AppRun"
 fi