Alexandre Julliard (@julliard) commented about include/winuser.h:
WINUSERAPI HCURSOR WINAPI SetCursor(HCURSOR); WINUSERAPI BOOL WINAPI SetCursorPos(INT,INT); WINUSERAPI VOID WINAPI SetDebugErrorLevel(DWORD); -WINUSERAPI BOOL WINAPI SetDeskWallPaper(LPCSTR);
There's no need to do that, it's OK to list undocumented functions in the headers.