handle kernel-version better, add arch detection to slim down arm overlays

pkgmk.in

@@ -251,9 +251,14 @@ make_md5sum() {
 }
 
 make_footprint() {
-	pkginfo --footprint $TARGET | \
-		sed "s|\tlib/modules/`uname -r`/|\tlib/modules/<kernel-version>/|g" | \
-		sort -k 3
+	KERNEL_VERSION=$(uname -r)
+	ARCH=$(uname -m)
+	
+	pkginfo --footprint "$TARGET" | \
+	sed \
+		-e "s|$KERNEL_VERSION|<kernel-version>|g" \
+		-e "s|$ARCH|<arch>|g" | \
+	sort -k 3
 }
 
 check_md5sum() {