[patch] Rename bits/mutex.h to avoid clashing with glibc

[Jonathan Wakely]

On 06/01/16 13:07 +0000, Jonathan Wakely wrote:
>Matthias discovered that the new <bits/mutex.h> header I created on
>trunk clashes with a libc header on GNU/Hurd, so this patch renames it
>to something unique.

This fixes the doxygen comment to match the new filename.

Committed to trunk.
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