Added zlib support to PHP 5.4 build.
Added zlib support to PHP 5.4 build.

cloudn/cf-php-buildpack-binary-build-scripts,cloudn/cf-php-buildpack-binary-build-scripts,dmikusa-pivotal/cf-php-buildpack-binary-build-scripts,dmikusa-pivotal/cf-php-buildpack-binary-build-scripts