Security update for tnef

This update for tnef fixes the following issues:

Security issue fixed:

- CVE-2017-8911: Fix underflow problem (boo#1038837).

Bug fixes:

- Update to version 1.4.15:
* Use __builtin_mul_overflow when available.
* Fixing Unicode related bugs introduced in previous release.
* Prevent against various cases of null derefences,
buffer overshooting, and fix some integer overflows.

Fixed bugs
bnc#1038837
VUL-0: CVE-2017-8911: tnef: integer underflow has been identified in the unicode_to_utf8() function
Selected Binaries
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