[PATCH] add set_shells_file function to getusershell module of gnulib

[Ben Asselstine]

Hi,

I find that the getusershell module is limited in which file it can
open (/etc/shells).  set_shells_file is a new function that allows the
user to open a shells file that is located elsewhere.

I've attached the patch rather than providing it inline, because I
didn't want to gamble with gmail's word-wrapping.

cheers,

Ben

gnulib_getusershell_set_shells_file.patch
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