Revert "Workaround hphpize injecting some bad include path"

Apparently fixed in current version of hhvm.

This reverts commit 7ec49b26babb9aa29ff1c204efe38f6eb9ccdf7e.

Bug: 68944
Change-Id: Iaf1f363aa70693f5e471711a6db733c8f25dbdff