Stop building verilator and OTT with gcc-11
Also remove spike build rules as they are no longer needed and spike
doesn't build on the latest gcc
Bypass-Presubmit-Reason: testing manually
Change-Id: Ib270971b39b84d08be9202280728c2521212deeb
This is the project containing all the top-level build targets of all the projects within the GoB to set up the environment and build the e2e artifacts.
