Merge pull request #4835 from martin-frbg/revertwin4359

Temporarily revert to the coarse-grained locking in the Windows thread server

Author: martin-frbg

common_thread.h

@@ -111,8 +111,8 @@ typedef struct blas_queue {
   struct blas_queue *next;
 
 #if defined( __WIN32__) || defined(__CYGWIN32__) || defined(_WIN32) || defined(__CYGWIN__)
-  // CRITICAL_SECTION lock;
-  // HANDLE finish;
+   CRITICAL_SECTION lock;
+   HANDLE finish;
   volatile int finished;
 #else
   pthread_mutex_t	 lock;