Fix build problem along with update of php53; overhaul.

* Don't specify upper limit version to depend.  Since PHP extensions are
  prefixed with PHP_PKG_PREFIX, it is no need to specify.
* Relax lower limit version to depend for php extensions which aren't
  bundled in PHP 5.3.9 distribution file; reflecting recent change of
  lang/php/ext.mk

To be safer, bump PKGREVISION.

(taca)