[issue7497] configure test for posix_semaphore capability leaves semaphore behind, on linux causing test to fail for other users

[R. David Murray]

R. David Murray <rdmurray at bitdance.com> added the comment:

According to the linux man page, to delete the named semaphore after all
processes are done with it one must call sem_unlink on it.  So an unlink
call should be added to both autoconf tests that use sem_open.

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