abuild: use file descriptor 9 instead of 200

POSIX only requires that filedesriptors 0-9 are available for shell
redirections.

abuild.in

@@ -309,8 +309,8 @@ uri_fetch() {
 
 	CLEANUP_FILES="$CLEANUP_FILES $lockfile"
 	(
-	flock -n -x 200 || msg "Waiting for ${lockfile##*/}..."
-	flock -x 200
+	flock -n -x 9 || msg "Waiting for ${lockfile##*/}..."
+	flock -x 9
 
 	[ -f "$SRCDEST/$d" ] && exit 0 # use exit since its a subshell
 
@@ -332,7 +332,7 @@ uri_fetch() {
 	$fetcher $opts -o "$SRCDEST/$d.part" "$uri" \
 		&& mv "$SRCDEST/$d.part" "$SRCDEST/$d"
 
-	) 200>$lockfile
+	) 9>$lockfile
 
 	local rc=$?
 	rm -f "$lockfile"