* Build LLVM at CMake config time and use CMake config file for dependencies.

* Temp save.

* Codegen functioning.

* Support prebuilt LLVM.

* Remove zlib.

* Relax CMake minimum version.

* Fix bug.

* Lower CMake version requirement.

* Pass more args.

* Add proper quote.

* Remove quotes.

* Try to separate flags for external projects.

* Don't pass flags to LLVM.

* Pass CXX abi.

* Remove stale print.

* Update gtest flags.

* Try to fix build issue.

* Patch LLVM to prevent building clang-tools-extra.
Co-authored-by: aslepko <44713115+aslepko@users.noreply.github.com>