luatex original locale info

[Karl Berry]

    While LuaTEX is running if forces the following locale settings:
    LC_CTYPE=C
    LC_COLLATE=C
    LC_NUMERIC=C

No question those settings are needed, but luatex could also provide the
original settings of those vars, just so programs can get the info if
they want it. (LC_CTYPE_orig, or a separate table, or whatever.)

Is it worth considering? Wdy(all)t? --thanks, karl.