gitlab-ci: update deqp build so we can generate xml

gitlab-ci: update deqp build so we can generate xml

Update the deqp build to preserve testlog-to-xml and stylesheets, so
deqp runner can extract .qpa for failed/flaked tests, and convert to
xml.  With this, will be able to browse output from failed tests
directly from the artifacts.

The main motiviation is to give better visibility into what happens with
flaked tests, when it is difficult/impossible to reproduce the flake
locally (ie. when it happens once out of N million tests).  But this
should also make it easier to debug regressions that a MR triggers,
especially when it is on hw that you don't have.

Signed-off-by: Rob Clark <robdclark@chromium.org>
Acked-by: Eric Engestrom <eric.engestrom@intel.com>