Implement various capture functions as required by the GLES1 tests
and GLES1 applications like Dr. Driving.

Implements glMultMatrixf,  glTexEnvxv, glLightxv, glLoadMatrixf and
glGetFixedv.

Bug: angleproject:5751
Change-Id: Id22899d755a9126f91b37eeea4619d6a03636f8a
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2756533Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Cody Northrop <cnorthrop@google.com>
Commit-Queue: Jamie Madill <jmadill@chromium.org>