win32: Don't run cleanup if we're about to exit anyway

If the process is about to exit, there's no point trying to do
a bunch of work to clean up resources. The kernel will release
them much more efficiently when the process exits at the end
of this function.

exports/dllinit.c

@@ -50,7 +50,10 @@ BOOL APIENTRY DllMain(HINSTANCE hInst, DWORD reason, LPVOID reserved) {
         gotoblas_init();
         break;
       case DLL_PROCESS_DETACH:
-        gotoblas_quit();
+        // If the process is about to exit, don't bother releasing any resources
+        // The kernel is much better at bulk releasing then.
+        if (!reserved)
+          gotoblas_quit();
         break;
       case DLL_THREAD_ATTACH:
         break;