move git_default_* variables to ident.c
There's no reason anybody outside of ident.c should access these directly (they should use the new accessors which make sure the variables are initialized), so we can make them file-scope statics. While we're at it, move user_ident_explicitly_given into ident.c; while still globally visible, it makes more sense to reside with the ident code. Signed-off-by: NJeff King <peff@peff.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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