[PATCH] Define __PTHREAD_MUTEX_HAVE_PREV only if undefined [BZ #22298]

[Andreas Schwab]

On Okt 16 2017, "H.J. Lu" <hjl.tools@gmail.com> wrote:

> __PTHREAD_MUTEX_HAVE_PREV is the same as __WORDSIZE == 64,

Just because it happens to match now does not mean that all new
architectures want to follow the idiosyncrasies of linuxthreads
compatibility.

Andreas.

-- 
Andreas Schwab, SUSE Labs, schwab@suse.de
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