abuild: allow SPDX license operators

valid operators are AND OR WITH

abuild.in

@@ -841,10 +841,12 @@ check_maintainer() {
 check_license() {
 	local ret=0
 	local license_list=/usr/share/spdx/license.lst
+	local exclude="AND OR WITH"
 	if options_has "!spdx" || ! [ -f "$license_list" ]; then
 		return 0
 	fi
 	local i; for i in $license; do
+		list_has "$i" $exclude && continue
 		if ! grep -q -w -F "$i" "$license_list"; then
 			ret=1
 			warning "\"$i\" is not a known license"