ports-mgmt/portlint: Update to 2.19.13

• Allow for a plus ('+') in other places in a PORTVERSION [1]
• Check for .dkestop file installation [2]
• Support the new Makefile WWW macro [3]

PR: 265364 [1]

		265551 [2]
		266068 [3]

Submitted by: Robert Clausecker [1]

		se [3]