user32: Make the MonitorFromRect() argument const.

dlls/user32/sysparams.c

@@ -3481,7 +3481,7 @@ static BOOL CALLBACK monitor_enum( HMONITOR monitor, HDC hdc, LPRECT rect, LPARA
 /***********************************************************************
  *		MonitorFromRect (USER32.@)
  */
-HMONITOR WINAPI MonitorFromRect( LPRECT rect, DWORD flags )
+HMONITOR WINAPI MonitorFromRect( const RECT *rect, DWORD flags )
 {
     struct monitor_enum_info info;
 

include/winuser.h

@@ -3981,7 +3981,7 @@ WINUSERAPI BOOL        WINAPI ModifyMenuA(HMENU,UINT,UINT,UINT_PTR,LPCSTR);
 WINUSERAPI BOOL        WINAPI ModifyMenuW(HMENU,UINT,UINT,UINT_PTR,LPCWSTR);
 #define                       ModifyMenu WINELIB_NAME_AW(ModifyMenu)
 WINUSERAPI HMONITOR    WINAPI MonitorFromPoint(POINT,DWORD);
-WINUSERAPI HMONITOR    WINAPI MonitorFromRect(LPRECT,DWORD);
+WINUSERAPI HMONITOR    WINAPI MonitorFromRect(const RECT*,DWORD);
 WINUSERAPI HMONITOR    WINAPI MonitorFromWindow(HWND,DWORD);
 WINUSERAPI BOOL        WINAPI MoveWindow(HWND,INT,INT,INT,INT,BOOL);
 WINUSERAPI DWORD       WINAPI MsgWaitForMultipleObjects(DWORD,const HANDLE*,BOOL,DWORD,DWORD);