abuild: allow skip FHS check

some package (alpine-baselayout) needs to create /usr/local/bin etc.

abuild.in

@@ -548,12 +548,14 @@ postcheck() {
 	local dir="$1" name="$2" i=
 	msg "Running postcheck for $name"
 	# checking for FHS compat
-	for i in "$dir"/srv/* "$dir"/usr/local/* "$dir"/opt/*; do
-		if [ -e "$i" ]; then
-			error "Packages must not put anything under /srv, /usr/local or /opt"
-			return 1
-		fi
-	done
+	if ! options_has "!fhs"; then
+		for i in "$dir"/srv/* "$dir"/usr/local/* "$dir"/opt/*; do
+			if [ -e "$i" ]; then
+				error "Packages must not put anything under /srv, /usr/local or /opt"
+				return 1
+			fi
+		done
+	fi
 	# look for *.la files
 	i=$(find "$dir" -name '*.la' | sed "s|^$dir|\t|")
 	if [ -n "$i" ] && ! options_has "libtool"; then