make armv8l supporting armv7l and below.

armv8l is basically an aarch64 cpu running in 32bit.

armv8l used to be a special handling in the MeeGo project, but it
conflicts now with official upstream definition from ARM.

common_functions

@@ -35,7 +35,7 @@ extend_build_arch() {
     case $BUILD_ARCH in
       aarch64) BUILD_ARCH="aarch64:aarch64_ilp32:armv8l" ;;
       aarch64_ilp32) BUILD_ARCH="aarch64_ilp32:aarch64:armv8l" ;;
-      armv8l) BUILD_ARCH="armv8l" ;; # armv8l is aarch64 in 32bit mode. not a superset of armv7
+      armv8l) BUILD_ARCH="armv8l:armv7hl:armv7l:armv6hl:armv6l:armv5tel" ;;
       armv7hl) BUILD_ARCH="armv7hl:armv7l:armv6hl:armv6l:armv5tel" ;;
       armv7l) BUILD_ARCH="armv7l:armv6l:armv5tel" ;;
       armv6hl) BUILD_ARCH="armv6hl:armv6l:armv5tel" ;;