Fix squashfuse build with newer automake versions

TheAssassin · TheAssassin · commit ed692d71dee4 · 2022-07-27T17:25:44.000+02:00
After updating the AppImageBuild Docker images, we had to adjust some
details around the build of mksquashfs within libappimage 0.1.x.
diff --git a/lib/libappimage b/lib/libappimage
@@ -1 +1 @@
-Subproject commit 13f401a4a384ec59ec9a144e2a7006adf751571f
+Subproject commit 9c1fae809dedbb3015e9cd5b46e2b5aab06df36e
