facebook/hhvm — pull request #4342 by tstarling (2014-11-26 00:44:07+00:00)
Title: Fix bundled PCRE build

Do not pass the "REQUIRED" argument when finding PCRE, since we now have
a bundled PCRE which we can use in the absence of a system library. The
only effect of REQUIRED was to make FIND_PACKAGE_HANDLE_STANDARD_ARGS()
fail with an error.