[PATCH] Speedup various nptl/tst-mutex5 tests.

[Stefan Liebler]

Hi,

each of these tests - tst-mutex5, tst-mutex5a, tst-mutexpi5
and tst-mutexpi5a - runs for 6s.

do_test_clock is called three times, which tries to lock the mutex
which times out after 2 seconds.

This patch reduces the timeout to 0.3 seconds which leads to a
runtime of roughly 0.9s for one tst-mutex5... invocation.
As the nptl tests run in sequence, this patch saves roughly 20s of
runtime for "make check".

Bye,
Stefan

ChangeLog:

	* nptl/tst-mutex5.c (do_test_clock): Reduce timeout.
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