[llvmbuildectomy] Also include component groups in llvm-config --components list

[llvmbuildectomy] Also include component groups in llvm-config --components list

Without this change mesa fails while looking for llvm components like amdgpu, engine or native:

    Run-time dependency LLVM (modules: amdgpu(missing), bitreader, bitwriter, core, engine(missing), executionengine, instcombine, ipo, mcdisassembler, mcjit, native(missing), scalaropts, transformutils, coroutines)
    Looking for a fallback subproject for the dependency llvm (modules: bitwriter, engine, mcdisassembler, mcjit, core, executionengine, scalaropts, transformutils, instcombine, amdgpu, native, bitreader, ipo)

This change adds component groups (like all-targets, engine, native, amdgpu) to the "all" component.

Differential Revision: https://reviews.llvm.org/D92158