* PRYSM-2849 first cut at multi-arch cross compiling toolchain. currently supports arm64 and amd64 via docker cross compiler image
* picky linter
* some readme cleanup
* remove arm 8.2 revision for arm64 builds (cortex a72 is ARMv8.0-A)
remove arm32 toolchain from multiarch dockerfile
* remove extranous WORKSPACE entries
* add docker remote execution configs for amd64 and arm64
* add osx bazelrc configs
* working osx toolchain
* update readme
* cleanup for amd, arm and osx cross before beginning windows
* initial stab at mingw windows cross
* add docker target for windows_amd64 and update readme for cross-compiling
* little more cleanup for readability
* Check in generated RBE. Still tweaking config but linux amd64 -> linux amd64 on RBE works OK. Cross compile does not work properly in RBE yet.
* fix
* update image
* Making some progress
* delete artifacts
* Working build
* Add remote config
* remove some things I added to README
* Tidy
* Update readme
* remove 2 commented lines
* buildifer
* Merge pull request #1 from prysmaticlabs/cross-compile-with-suburbandad
Cross compile with suburbandad
* Merge branch 'master' into clang-cross-compile
* buildifier on generated stuff
* Merge branch 'master' into clang-cross-compile
* Merge branch 'master' into clang-cross-compile
* Merge branch 'master' into clang-cross-compile
