php53: skip the Apache module (for now)

Would conflict with Slackware's, at least in the default install location.
Will probably be added back somewhere in the future, in a way you can choose
which version of the Apache module to use in httpd.conf, but first things first.
php53: skip Apache module (mod_php) conf files

No need for them, the module itself already is disabled.
php53: use /etc/php53 for PHP confs of this version

Keeps it isolated, reduces the risk of mixing together configuration files
of different PHP versions (or using the configuration file for the wrong
version altogether) which would probably result in mayhem.
php53: put pear.conf in /etc/php53 too