This makes the Linux GN builds use the Chromium copy of binutils and
also makes all platforms use the "custom libcxx" which is libc++.
We do this so that the build doesn't depend on anything from the system
on Linux because our bots are still on trusty with very old libstdc++
and linkers.
Change-Id: I0570fb474f2945c3565e78a56aba66c1a2619afc
In the DEPS file we are going to use Chromium's mirror of
github.com/KhronosGroup/SPIRV-Cross so we need to adjust .gitmodules to
point to it instead of Kangz/SPIRV-Cross. Also take that opportunity to
roll SPIRV-Cross.
Change-Id: I4f53a4fc54f5b1b9a754ac55e976c81e5eeabeb2
This makes the Jinja2 (and MarkupSafe) installation hermetic by
adding it to the DEPS and making the code generator add them in the
first spot of the python path.