This includes deprecating std.c.*, which apparently was marked as
scheduled for deprecation in 2.068 but never actually deprecated (though
it looks like it was previously removed from the documentation build,
since it doesn't show up on dlang.org).
* Transformed std.c.linux.* into wrappers around core.sys.posix modules where appropriate.
* Added std.c.osx as the OSX equivalent of std.c.linux.
* Added std.c.osx.socket for OSX-specific socket declarations not covered by the Posix spec.
* Altered all makefiles to zip, etc, the new std.c.osx package.
