Merge pull request #3484 from martin-frbg/issue3481

Enable delayed (re)init of Windows threads beyond Cygwin

Author: martin-frbg

driver/others/blas_server_win32.c

@@ -40,7 +40,7 @@
 #include <stdlib.h>
 #include "common.h"
 
-#if defined(OS_CYGWIN_NT) && !defined(unlikely)
+#if !defined(unlikely)
 #ifdef __GNUC__
 #define unlikely(x) __builtin_expect(!!(x), 0)
 #else
@@ -391,8 +391,9 @@ int blas_thread_init(void){
 
 int exec_blas_async(BLASLONG pos, blas_queue_t *queue){
 
-#if defined(SMP_SERVER) && defined(OS_CYGWIN_NT)
+#if defined(SMP_SERVER)
   // Handle lazy re-init of the thread-pool after a POSIX fork
+  // on Cygwin or as delayed init when a static library	is used
   if (unlikely(blas_server_avail == 0)) blas_thread_init();
 #endif