Add LibC::MAP_ANONYMOUS to x86_64-darwin to match other platforms #10398
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I guess this bit of the standard library is mostly for internal use, but I noticed that all the BSD platforms except Darwin have a
LibC::MAP_ANONYMOUSsynonym forLibC::MAP_ANON, presumably to mirror the synonyms in the actual libc headers and to improve portability of code usingmmap, so I added that to make it consistent with the others.