winpthreads/cond.c: Only update `waiters_count_` with `waiters_count_lock_` locked.

Signed-off-by: Liu Hao <lh_mouse@126.com>

mingw-w64-libraries/winpthreads/src/cond.c

diff --git a/mingw-w64-libraries/winpthreads/src/cond.c b/mingw-w64-libraries/winpthreads/src/cond.c
index 368ee8a..8df395e 100644
--- a/mingw-w64-libraries/winpthreads/src/cond.c
+++ b/mingw-w64-libraries/winpthreads/src/cond.c
@@ -488,7 +488,9 @@
   r = do_sema_b_wait (_c->sema_b, 0, INFINITE,&_c->waiters_b_lock_,&_c->value_b);
   if (r != 0)
     return r;
+  EnterCriticalSection (&_c->waiters_count_lock_);
   _c->waiters_count_++;
+  LeaveCriticalSection(&_c->waiters_count_lock_);
   r = do_sema_b_release (_c->sema_b, 1,&_c->waiters_b_lock_,&_c->value_b);
   if (r != 0)
     return r;