Remove use of pthread_cond_timedwait_monotonic.

Use posix compliant pthread_condattr_setclock instead.
Also, remove usage of HAVE_TIMEDWAIT_MONOTONIC and replace
it with a specific reference to the only supported platform
that doesn't have it.

Change-Id: I933f05c5b4965bab88ccd8e3e26c91549ed4184d
1 file changed