Clean up handling of unsafe semaphore.
* configure.ac (HAVE_FORK_UNSAFE_SEMAPHORE): Remove. (NPTH_FORK_FAILURE): New conditional. * src/npth.c (NPTH_SEMAPHORE_PSHARED): Remove. (npth_init): Simply use a semaphore not shared by multiple processes. * tests/Makefile.am (t-fork): XFAIL_TESTS on AIX.
- GnuPG-bug-id: T6947
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>