ole32: Implement CoFreeUnusedLibrariesEx.

Fix CoFreeUnusedLibraries to use a delay of 10 minutes when used with 
multi-threaded apartments.
diff --git a/include/objbase.h b/include/objbase.h
index 4d94c05..33fe4c9 100644
--- a/include/objbase.h
+++ b/include/objbase.h
@@ -329,6 +329,7 @@
 void WINAPI CoFreeAllLibraries(void);
 void WINAPI CoFreeLibrary(HINSTANCE hLibrary);
 void WINAPI CoFreeUnusedLibraries(void);
+void WINAPI CoFreeUnusedLibrariesEx(DWORD dwUnloadDelay, DWORD dwReserved);
 
 HRESULT WINAPI CoCreateInstance(REFCLSID rclsid, LPUNKNOWN pUnkOuter, DWORD dwClsContext, REFIID iid, LPVOID *ppv);
 HRESULT WINAPI CoCreateInstanceEx(REFCLSID      rclsid,