pdh: Don't bother to delete critical sections at process exit.

dlls/pdh/pdh_main.c

@@ -93,6 +93,7 @@ BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
         DisableThreadLibraryCalls(hinstDLL);
         break;
     case DLL_PROCESS_DETACH:
+        if (lpvReserved) break;
         DeleteCriticalSection(&pdh_handle_cs);
         break;
     }