The script used to have partial support for specifying complete paths to
the files it referenced, but the patch command didn't work if the
working directory wasn't src/compiler/translator. It's simplest to fix
the script by just changing the working directory in the script.

Change-Id: If3642cbe11436d8c7553cd1812ee0f6c19fe990b
Reviewed-on: https://chromium-review.googlesource.com/320270Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Olli Etuaho <oetuaho@nvidia.com>