dev-util/valgrind: upgrade to 3.10.1

Upgrade to 3.10.1, needed specifically so valgrind compiles for boards
with kernel 4.4.

Compared to upstream, this CL includes:
- patch for glibc version 2.23 introduced by CL:428331 instead of
patches for glibc 2.21 and 2.22
- modifies ebuild to use  KEYWORD="*"

Cleanup:
The CL also deletes unused non-exec-stack patch against 3.9.0.

BUG=chromium:710144
TEST=emerge-eve valgrind
TEST=emerge-kevin valgrind
TEST=emerge-{amd64,arm}-generic valgrind
TEST=emerge-x86-generic valgrind fails (clang-syntax, will file bug) but
3.10.0-r1 is not building either anyway.
TEST='valgrind ls' on eve

Change-Id: I310051ee8d005b50416a9c48a366de115f4a015f
Reviewed-on: https://chromium-review.googlesource.com/470006
Commit-Ready: Nicolas Norvez <norvez@chromium.org>
Tested-by: Nicolas Norvez <norvez@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
6 files changed