pidgin/pidgin

Install our appdata file to $(datadir)/metainfo as that change was made a long time ago

This patch originates from Lars Wendler from Gentoo

https://gitweb.gentoo.org/repo/gentoo.git/commit/net-im/pidgin/files/pidgin-2.13.0-metainfo.patch?id=2dd6c1852251b5b67c3045badf173be9535b97a9

Testing Done:
Installed to a prefix and verified the file ended up in `$prefix/share/metainfo`

Reviewed at https://reviews.imfreedom.org/r/607/
/* This file is part of the Project Athena Zephyr Notification System.
* It contains source for the ZClosePort function.
*
* Created by: Robert French
*
* Copyright (c) 1987 by the Massachusetts Institute of Technology.
* For copying and distribution information, see the file
* "mit-copyright.h".
*/
#include "internal.h"
Code_t ZClosePort()
{
if (__Zephyr_fd >= 0 && __Zephyr_open)
(void) close(__Zephyr_fd);
__Zephyr_fd = -1;
__Zephyr_open = 0;
return (ZERR_NONE);
}