user32: Mark internal functions with hidden visibility.

dlls/user32/dde_private.h

@@ -236,6 +236,8 @@ extern	WDML_INSTANCE*	WDML_GetInstanceFromWnd(HWND hWnd) DECLSPEC_HIDDEN;
 extern	void		WDML_BroadcastDDEWindows(LPCWSTR clsName, UINT uMsg,
 						 WPARAM wParam, LPARAM lParam) DECLSPEC_HIDDEN;
 extern	void		WDML_NotifyThreadExit(DWORD tid) DECLSPEC_HIDDEN;
+extern	void 		WDML_NotifyThreadDetach(void) DECLSPEC_HIDDEN;
+
 
 static inline void WDML_ExtractAck(WORD status, DDEACK* da)
 {

dlls/user32/user_private.h

@@ -204,11 +204,11 @@ struct dce;
 
 extern BOOL CLIPBOARD_ReleaseOwner(void) DECLSPEC_HIDDEN;
 extern BOOL FOCUS_MouseActivate( HWND hwnd ) DECLSPEC_HIDDEN;
-extern BOOL set_capture_window( HWND hwnd, UINT gui_flags, HWND *prev_ret );
+extern BOOL set_capture_window( HWND hwnd, UINT gui_flags, HWND *prev_ret ) DECLSPEC_HIDDEN;
 extern void free_dce( struct dce *dce, HWND hwnd ) DECLSPEC_HIDDEN;
 extern void invalidate_dce( HWND hwnd, const RECT *rect ) DECLSPEC_HIDDEN;
 extern void erase_now( HWND hwnd, UINT rdw_flags ) DECLSPEC_HIDDEN;
-extern void *get_hook_proc( void *proc, const WCHAR *module );
+extern void *get_hook_proc( void *proc, const WCHAR *module ) DECLSPEC_HIDDEN;
 extern LRESULT call_current_hook( HHOOK hhook, INT code, WPARAM wparam, LPARAM lparam ) DECLSPEC_HIDDEN;
 extern BOOL map_wparam_AtoW( UINT message, WPARAM *wparam, enum wm_char_mapping mapping ) DECLSPEC_HIDDEN;
 extern NTSTATUS send_hardware_message( HWND hwnd, const INPUT *input, UINT flags ) DECLSPEC_HIDDEN;