Added BBA TAP backend for OS X.

TUN/TAP OS X needs to be installed, and /dev/tap0 chown’d to the user.
The tap0 network interface doesn’t appear until /dev/tap0 is opened by
the program, so all bridging must be done once the game is already
running.

Unfortunately, bridging seems to be broken on OS X, so this does not
actually work over LAN (yet!).
OpenGL backend: remove useless header Globals.h.

The header has no content, so it can can just be deleted.
Merge pull request #268 from magumagu/opengl-delete-useless-header

OpenGL backend: remove useless header Globals.h.
Merge pull request #262 from SlEePlEs5/master

Added BBA TAP backend for OS X.