Allow for a plus in other places in a version.

PR:		265364
Submitted by:	Robert Clausecker

portlint.pl

@@ -2972,7 +2972,7 @@ DIST_SUBDIR EXTRACT_ONLY
 		&perror("FATAL", $file, -1, "either PORTVERSION or DISTVERSION must be specified");
 	}
 	if ($portversion =~ /^pl[0-9]*$/
-	|| $portversion =~ /^[0-9]*[A-Za-z]?[0-9]*(\.[0-9]*[A-Za-z]?[0-9+]*)*$/) {
+	|| $portversion =~ /^[0-9]*[A-Za-z]?[0-9]*([.+][0-9]*[A-Za-z]?[0-9+]*)*$/) {
 		print "OK: PORTVERSION \"$portversion\" looks fine.\n" if ($verbose);
 	} elsif ($portversion =~ /^[^\-]*\$[{\(].+[\)}][^\-]*$/) {
 		&perror("WARN", $file, -1, "using variable, \"$portversion\", as version ".