This adds in a script for updating DEPS and another for pulling in the
specified versions in the DEPS file.
DEPS entries that are not part of the documented build processs are
removed. Using the documented cmake process with them made for a very
sad state of one's checkout. If this removal breaks workflows we can
revist this, since the state is saved in git.
DEPS are rolled forward, so that this is taking use to a known good
state. These look like scary big rolls, but in reality the bots and
most people are running near HEAD for external/, so this integration
should already have been tested.
Summary of DEPS roll:
+ Rolling 3 dependencies
+ Roll external/effcee/ 04b624799..b83b58d17 (14 commits)
+ Roll external/googletest/ 98a0d007d..2f42d769a (576 commits)
+ Roll external/re2/ 6cf8ccd82..848dfb7e1 (90 commits)
+ Created with:
+ roll-dep external/effcee external/googletest external/re2 external/spirv-headers
Fixes#2665
