[PATCH] Clean up semaphore EINTR handling after Linux futex docs clarification.

[Torvald Riegel]

The Linux kernel futex documentation now states that since Linux 2.6.22,
FUTEX_WAIT does return EINTR only when interrupted by a signal, and not
spuriously anymore.  We only support more recent kernels, so clean up
EINTR handling in the semaphore and update the comments.

This is code and mostly comments clean-up, no behavioral change.  I've
put this on top of the futex API patch I just sent because that one
documents the conditions under which futex_wait can return EINTR.

I intend to commit this unless I hear objections.

2015-06-08  Torvald Riegel  <triegel@redhat.com>

	* nptl/sem_waitcommon.c (__new_sem_wait_slow): Update comments.
	(sem_assume_only_signals_cause_futex_EINTR): Remove.

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