* m4/lock.m4, m4/threadlib.m4: New.  From libgpg-error master.
* m4/Makefile.am (EXTRA_DIST): Add them.
* configure.ac (HAVE_PTHREAD): Remove test and ac_define.
(gl_LOCK): Do not use under Windows.
(LIBGCRYPT_CONFIG_LIBS): Add LIBTHREAD to support non-ELF pthread
systems.
* src/Makefile.am (dumpsexp_LDADD, mpicalc_LDADD, hmac256_LDADD)
(gcryptrnd_LDADD): Add LIBTHREAD.
* src/ath.c: Include pthread for any pthread version.
(ath_init, ath_install, ath_mutex_init, ath_mutex_destroy)
(ath_mutex_lock, ath_mutex_unlock): Support non-weak symbol pthread
systems.
* tests/Makefile.am (LDADD): Add LIBTHREAD.
* tests/t-lock.c: Replace HAVE_PTHREAD by USE_POSIX_THREADS
(run_test): Run only under W32 or pthread.