Security update for expat

This update for expat fixes the following issues:

Security issue fixed:
- CVE-2016-0718: Fix Expat XML parser that mishandles certain kinds of malformed input documents. (bsc#979441)
- CVE-2015-1283: Fix multiple integer overflows. (bnc#980391)
This update was imported from the SUSE:SLE-12:Update update project.

Fixed bugs
bnc#979441
VUL-0: EMBARGOED: CVE-2016-0718: expat: XML Parser Crashes on Malformed Input
bnc#980391
VUL-0: CVE-2015-1283: expat: Heap-buffer-overflow in expat
Selected Binaries
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