lua_strlen

[Reuben Thomas <rrt1001@...>]

Since API functions are allowed to be macros, why not take advantage of this
and 

#define lua_strlen(L, s) lua__strlen(s)

(and similarly for other functions that don't use the state)? I agree that
it's sensible to make pretty much all functions in the API apart from
lua_open take a state, but you don't have to force it to be passed where
it's not used.

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