ruby-opengl
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Support FreeBSD
These changes add support for the FreeBSD platform, and perhaps make it slightly easier to support other X11 platforms in the future.
Technically the only change required would have been to trick the library into treating FreeBSD as Linux, however I also took the step to rename the platform specific files into interface specific ones, and then properly added another symbol to represent the new platform and reused the existing X11 specific GLX interface file.
In theory we could do the same for OpenBSD and NetBSD et. al., or even do a generic BSD platform; however, I do not have those platforms to test with and I figured this was a good start.