abuild: allow override sanitycheck

abuild.in

@@ -95,7 +95,7 @@ die() {
 }
 
 # check if apkbuild is basicly sane
-sanitycheck() {
+default_sanitycheck() {
 	local i= j= suggestion=
 	msg "Checking sanity of $APKBUILD..."
 	[ -z "$pkgname" ] && die "Missing pkgname in APKBUILD"
@@ -180,6 +180,10 @@ sanitycheck() {
 	return 0
 }
 
+sanitycheck() {
+	default_sanitycheck
+}
+
 md5check() {
 	local dummy f endreturnval originalparams origin file
 	if [ -z "$source" ]; then