fixed path to mysql libraries linker
Merge branch 'master' of https://github.com/mcuadros/homebrew-hhvm

* 'master' of https://github.com/mcuadros/homebrew-hhvm:
  fixed path to mysql libraries linker
Merge branch 'master' of https://github.com/mcuadros/homebrew-hhvm

* 'master' of https://github.com/mcuadros/homebrew-hhvm:
  hhvm: GCC 4.9 Release stable
  refactoring depends homebrew-hhvm