facebook/hhvm — pull request #3200 by danslo (2014-07-16 07:15:01+00:00)
Title: unset another cached variable for dwarf detection

We're not actually broken right now because of the way we fall-back to
dwarf_producer_init_c, but a function exists check is still being
skipped due to CMake caching. That could potentially confuse things
if/when another init function were to be added in the future.