Fixes X11 Problem

Remove hack with X11 lib, because homebrew removes it anyway.
https://github.com/Homebrew/homebrew-science/pull/723#issuecomment-42023
408

Added regular x11 depends_on
Removed X11 dependancy

Removed X11 dependancy, we don’t need it for Mac at all, because we
build with native Qt.
Merge pull request #2 from anatolix/master

anatolix: eliminate X11 dependency