abuild: fix getfattr match

it's a regular expression, not shell pattern. empty match will
match everything (default is ^user\\.)

abuild.in

@@ -1886,7 +1886,7 @@ stripbin() {
 	scanelf --recursive --nobanner --etype "ET_DYN,ET_EXEC" . \
 		| sed -e 's:^ET_DYN ::' -e 's:^ET_EXEC ::' \
 		| while read filename; do
-		XATTR=$(getfattr --match="*" --dump "${filename}")
+		XATTR=$(getfattr --match="" --dump "${filename}")
 		${CROSS_COMPILE}strip "${filename}"
 		[ -n "$XATTR" ] && (echo "$XATTR" | setfattr --restore=-)
 	done