unrar: security bump to version 5.5.8

Fixes the following security issues:

CVE-2017-12938 - UnRAR before 5.5.7 allows remote attackers to bypass a
directory-traversal protection mechanism via vectors involving a symlink to
the . directory, a symlink to the .. directory, and a regular file.

CVE-2017-12940 - libunrar.a in UnRAR before 5.5.7 has an out-of-bounds read
in the EncodeFileName::Decode call within the Archive::ReadHeader15
function.

CVE-2017-12941 - libunrar.a in UnRAR before 5.5.7 has an out-of-bounds read
in the Unpack::Unpack20 function.

CVE-2017-12942 - libunrar.a in UnRAR before 5.5.7 has a buffer overflow in
the Unpack::LongLZ function.

For more details, see
http://www.openwall.com/lists/oss-security/2017/08/14/3

While we're at it, add a hash for the license file.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

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