valgrind: bump to version 3.10

Patches status:

  valgrind-0001-workaround-SIGSEGV-on-PPC: Don't know. In doubt, I
     prefer to keep it.

  valgrind-0002-don-t-enable-largefile-support-unconditionally-on-uC:
     Seems still necessary

  valgrind-0003-Add-replacement-for-a.out.h: Upstreamed

  valgrind-0004-remove-default-mips-flags: Upstreamed

  valgrind-0005-glibc-2.19: Upstream now support glibc up to 2.20

Signed-off-by: Jérôme Pouiller <jezz@sysmic.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>