Fix compilation of PHP 5.3.3 and 5.3.2

Fixes to build `5.3.3` and `5.3.2` for #16 

- [x] Adds the libevent package which allows `5.3.3` to correctly configure
- [x] Fixes php binaries installing with a .dSYM prefix, which then triggers a rollback

FPM only came packaged with PHP from `5.3.3` onwards, so this will remove FPM support (temporarily) from `5.3.2`

- [x] Only enable FPM for versions >= `5.3.3`