buildrepo: don't break if there are -*.apk files in dir

apk takes files that starts with - as params.

buildrepo.in

@@ -105,7 +105,7 @@ build() {
 	tmpindex=$(mktemp).tar.gz
 	apk index --rewrite-arch $arch $oldindex -o $tmpindex \
 		--description "$repo $(cd $aportsdir && git describe)" \
-		*.apk
+		-- *.apk
 	abuild-sign $tmpindex && mv $tmpindex APKINDEX.tar.gz
 	chmod 644 APKINDEX.tar.gz
 	rm -f tmp.*