Allow a master port to have its last line be ".endif"

PR:		251430

portlint.pl

@@ -2624,9 +2624,10 @@ xargs xmkmf
 		#$slaveport = 0;
 		print "OK: non-slave port detected, checking for anything after bsd.port(.post).mk.\n"
 			if ($verbose);
-		if ($whole !~ /\n\.include\s+<bsd\.port(?:\.post)?\.mk>\s*$/s) {
+		if ($whole !~ /\n\.include\s+<bsd\.port(?:\.post)?\.mk>\s*$/s &&
+		    $whole !~ /\n\.endif\s*$/s) {
 			&perror("FATAL", $file, -1, "the last line of Makefile has to be".
-				' .include <bsd.port(.post).mk>');
+				' .include <bsd.port(.post).mk> (or .endif in the case of a conditional)');
 		}
 		if ($whole =~ /^MASTERDIR\s*[+?:!]?\s*=/m) {
 			&perror("WARN", $file, -1, "non-slave ports may not define MASTERDIR");