[PATCH] malloc: Use __libc_lock interfaces directly

[Florian Weimer]

This removes the mutex_t wrappers.  The benefit is that it is easier to
introduce direct dependencies on lock implementation details—otherwise,
I would have to provide __libc_lock definitions *and* mutex_t definitions.

On x86_64-redhat-linux-gnu, the only assembly changes are due to moved
line numbers in asserts.

Florian
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