I have just recompiled Lua, wxLua and wxWidgets for 64 bits on Windows and everything runs fine as per the previous versions (i.e. Lua 5.3.5 and the rest).
Except that math.randomseed(os.clock()) is not working. It does not like that clock as parameter. I have read that the seed parameter can be 128 bits wide, and I assume that I get an integer from clock().