* w32-pth.c (pth_kill): Just release the crit section if
pth_init was really called. And set all handles to NULL.
(_pth_strerror): New.
(do_pth_wait): Before we enter the loop we check if there
are too much events in the ring.
* w32-pth.c (enter_pth, leave_pth): New.
(pth_init): Initialize global mutex section.
(pth_kill): Release global mutex section.
(helper_thread): New.
(pth_spawn): Make sure only one thread is running.
* w32-pth.c, w32-pth.h: New.
* Makefile.am (gpgsm_LDADD): Put libassuan before jnlib because
under W32 we need the w32 pth code from jnlib.
* misc.c (setup_pinentry_env) [W32]: Disabled.