Recommended update for gdb

This update for gdb provides the following fixes:

- Fix infinite recursion in demangler. (bsc#987637)
- Ignore further vdso filenames on ppc64 and s390x. (bsc#944105)
- Fix two test cases on ppc64le. (bsc#994537)

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

Fixed bugs
bnc#944105
warning: Could not load shared library symbols for linux-vdso64.so.1.
bnc#987637
VUL-1: CVE-2016-6131: gdb: libiberty emangler segfaults
bnc#994537
SLES12 SP2 - GDB source test cases fails in large numbers
Selected Binaries
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