The .in.in file was added to the repo in 8bdfa6a4e56f. Then Gary added the .in file to POTFILES.in in 1d98555... but I think it should actually be the .in.in file, right?
/*
* Purple
*
* Purple is the legal property of its developers, whose names are too
* numerous to list here. Please refer to the COPYRIGHT file distributed
* with this source distribution
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1301,
* USA.
*/
#include"internal.h"
/* this should become "util.h" if we ever get this into purple proper */
#include"debug.h"
#include"mime.h"
#include"util.h"
/*
* Utility structure used in both MIME document and parts, which maps
* field names to their values, and keeps an easily accessible list of