Security update for expat

This update for expat fixes the following issues:

- CVE-2016-9063: Possible integer overflow to fix inside XML_Parse leading to unexpected behaviour (bsc#1047240)
- CVE-2017-9233: External Entity Vulnerability could lead to denial of service (bsc#1047236)

This update was imported from the SUSE:SLE-12:Update update project.

Fixed bugs
bnc#1047240
VUL-0: CVE-2016-9063: expat: Possible integer overflow to fix inside XML_Parse in Expat
bnc#1047236
VUL-0: CVE-2017-9233: expat: External Entity Vulnerability in Expat 2.2.0 And Earlier
Selected Binaries
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