add support for Lua 5.4 #12
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_helpers.c is a copy from luaposix, and needs one trivial change for
compatibility with Lua 5.4. luaposix added 5.4 support by appending
a
LUA_VERSION_NUM == 504
case to an existing #ifdef for 502 and 503.I chose instead to change it to >= 502, to fix for this 5.4 and avoid
encountering this issue again with the next Lua update.