Enable php-cli version choice in drushrc.php

[macmladen]

While having declared export DRUSH_PHP='/usr/local/php53/bin/php' is good option, on linux multiuser system there would be need to declare each user in .bashrc for this change.

While not too hard, option to do so on drush installation resource would make transition to 6.x easier for sys-admins.

It seems that the best place would be just inside DRUSH_PHP code block (55-76 lines in drush).

Should I submit patch or will someone else do it?

[greg-1-anderson]

Maybe you should put your DRUSH_PHP export into /etc/bash.bashrc? The drush script does not parse drushrc.php.

Re-open if you have an idea to improve things, though.