[gentoo-dev] Revbumped php-ext-* eclasses

[Ole Markus With]

Hi all,

As a step towards minor version slotting of PHP, we need allow PHP
extensions to compile against multiple versions of PHP and the attached
eclasses allow for just that. In addition, there are numerous cleanups,
such as the merging of php-ext-base and php-ext-source, dropping
dependency on the depend.php eclass.

The eclass goes together with the minor version slotted ebuilds and an
eselect module that can currently be found in the gentoo overlay[1].
Once these revised eclasses have been accepted, the ebuilds and the
eselect module will enter the tree in a masked state and we will
gradually rewrite PHP extension ebuilds to support minor version slotting.

Since we want to use USE_EXPAND, adding these eclasses also involves
adding the PHP_TARGETS variable to USE_EXPAND.

The eclasses have mostly been revised by me, and I do not have that much
experience writing eclasses/ebuilds, so any comments are highly appreciated.

[1] http://git.overlays.gentoo.org/gitweb/?p=proj/php.git

Cheers,
Ole Markus