Recommended update for gdb

This update for gdb fixes the following issues:

- GDB fails to attach to multi-threaded processes on the s390x architecture.
(bsc#976404, bsc#970589)
- GDB could terminate with a segmentation fault when printing values from
binaries built with some non-standard build options. (bsc#971556)

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

Fixed bugs
bnc#971556
gdb segfaults when examining a core file
bnc#976404
gdb 7.9.1-3.2 broken on SLES 11 SP1 thru SP4 on zSeries (L3:)
bnc#970589
Debuggee process is put in the background when exiting gdb on zSeries
Selected Binaries
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