nginx search for libz.a on this path.

(cherry picked from commit e5a5ea50)

Inspired by the work of Thomas Lechauve for html5as

This was created by Thomas Lechauve originally.

This commit split PHP compilation into apache and nginx version.

Like described here:

  - http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=667198

Slave errors must NOT stop processing of other slaves

I know, it's an ugly commit, my bad.