Security update for libgit2

This update for libgit2 fixes the following issues:

- CVE-2016-8568: Fixed and out-of-bounds read in git_oid_nfmt (bsc#1003810).
- CVE-2016-8569: DoS using a null pointer dereference in git_commit_message (bsc#1003810).

Fixed bugs
bnc#1003810
VUL-0: CVE-2016-8568, CVE-2016-8569: libgit2: invalid memory accesses parsing object files
Selected Binaries
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