Introduces USES= iconv to replace USE_ICONV.

It takes no arguments.

This deprecates USE_ICONV, please convert your ports.
USE_ICONV will be removed as soon as it is no more used in
the ports tree.

Approved by:	portmgr (bapt)

Conflicts:
	CHANGES
partial commit of a99e7e687dd8959b456b245eeaafe101878e92d8
partial commit of 5ccb234898284c2ac9019b68adf7e55a53e6f6cc

Author: ohauer <ohauer@FreeBSD.org>
Date:   Sat Jul 6 08:46:39 2013 +0000

    - add fix for CVE-2013-1862
    - adjust vuxml
partial commit of 31dd4fd824aafa89c7f4eb95e23f32974c053110

- update to 2.2.25