Mk/Uses/php.mk: Flag invalid args

[tobik]

Summary

Flag invalid USES=php arguments to avoid mistakes like

USES=		php:filter,gettext

instead of

USES=		php
USE_PHP=	filter gettext

Test Plan

Ran make -V IGNORE over the tree. The following ports had problems (I've already fixed them):

Origin						Invalid USES=php args			Fixed in
net-mgmt/nagiosql				filter gettext mysql session simplexml	rP497106
net-mgmt/glpi-plugins-fusioninventory-server	fileinfo (and simplexml, wddx [1])	rP497107

[1] Those are not flagged since USES=php is included multiple times.

[ale]

Mk/Uses/php.mk

7 ↗

(On Diff #55591)

I don't think "one of" is the correct wording, you can combine a few of them.

[tobik]

• Update "Valid ARGS" comment with missing components

[ale]

LGTM