erasure-code: update gf-complete v1 submodule

Point to https://bitbucket.org/dachary/gf-complete/branch/v1 which
aggregates the pending pull requests required by Ceph while they are
reviewed.

Signed-off-by: Loic Dachary <loic@dachary.org>
erasure-code: disable SSE extensions

Until jerasure-2 / gf-complete is able to detect them at runtime.

http://tracker.ceph.com/issues/7757 refs #7757

Signed-off-by: Loic Dachary <loic@dachary.org>