Append PID to names passed to shm_open in shm tests to avoid random
FAIL: rt/tst-shm-cancel
FAIL: rt/tst-shm
due to the same name passed to shm_open and shm_unlink when more than
one "make check" running in parallel on the same machine.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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