[PATCH] unbreak uncomressed files with tar, modutils, and man

[ibid.ag at gmail.com]

This afternoon I updated a small system to git HEAD, rebooted, 
and discovered that modprobe no longer worked.
Specifically, it spat out an error like this:
modprobe: no gzip/bzip2/xz magic
grep helped me track this down to archival/libarchive/open_transformer.c.

I'm using uncompressed modules, so I need modprobe to simply proceed on
when an uncompressed file is encountered.
This was the most obvious way to do that; in the process, I happened to find
and fix similar issues in man and tar.

I'm not sure how far back this is an issue; it looks like it may be from 
this commit:

commit 7c47b560a8fc97956dd8132bd7f1863d83c19866
Author: Denys Vlasenko <vda.linux at googlemail.com>
Date:   Fri Jan 10 14:06:57 2014 +0100

    libarchive: open_zipped() does not need to check extensions for e.g. gzip


Thanks,
Isaac Dunham
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