Recommended update for valgrind

This update for valgrind provides the following fixes:

- Disable LTO. (bsc#1133288)
- Update to 3.15.0. (fate#327402)

This update was imported from the SUSE:SLE-15-SP1:Update update project.

Fixed bugs
bnc#1133288
LTO: valgrind build fails
Selected Binaries
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