webkitgtk: trigger rebuild for armv6hf-musl

Also fix copying / moving source tree

srcpkgs/webkitgtk/template

@@ -44,6 +44,9 @@ pre_configure() {
 	for v in 3.0 2.0; do
 		mkdir -p /tmp/$v
 		cp -a $wrksrc/* /tmp/$v
+	done
+	rm -r $wrksrc/*
+	for v in 3.0 2.0; do
 		mv /tmp/$v $wrksrc/$v
 	done
 }