Security update for libgit2

This update for libgit2 fixes the following issues:

Security issues fixed:

- CVE-2018-19456: Fixed a code execution by malicious .gitmodules file (bsc#1110949)
- various string-to-integer and buffer handling fixes (bsc#1114729).

This update was imported from the SUSE:SLE-12-SP2:Update update project.

Fixed bugs
bnc#1114729
VUL-0: libgit2: various string-to-integer and buffer handling issues fixed in 0.27.6, 0.26.8
bnc#1110949
VUL-0: CVE-2018-17456: git,libgit2: arbitrary code execution via .gitmodules
Selected Binaries
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