RTEMS Source Builder | Draft: Support for building LLVM toolchains for RISC-V and SPARC (!308)

[Daniel Kowalski (@kowal256)]

Daniel Kowalski created a merge request: https://gitlab.rtems.org/rtems/tools/rtems-source-builder/-/merge_requests/308

Project:Branches: kowal256/rtems-source-builder:llvm4space-llvm-update-rebased to rtems/tools/rtems-source-builder:main
Author: Daniel Kowalski

## Summary

Add support for building multilib LLVM-based toolchains

This MR adds new build-sets rtems-riscv-llvm and rtems-sparc-llvm that build LLVM toolchains with newlib as C library,

multilib.yaml files for multilib variants selection are included for RISC-V and SPARC platforms, build-sets list multilib variants to be compiled as triples 

target:subdirectory:compile flags

other platforms can be added using similar pattern, multilib.yaml installed in resulting clang toolchain must match list of variants.

clang is compiled using ninja tool, newlib is used as C library, clang_rt.builtins, clang_rt.profile, libcxx, libcxxabi, libunwind are built for each multilib variant

libgcc.a is symlinked to libclang_rt.builtins.a for programs using -lgcc in build flags

Use 7/rtems-sparc-llvm or 7/rtems-riscv-llvm build sets to build toolchains 

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View it on GitLab: https://gitlab.rtems.org/rtems/tools/rtems-source-builder/-/merge_requests/308
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