Package Cling C++ interpreter

[blockspacer]

Proof of concept: https://github.com/blockspacer/cling_conan.git

My use case: I use libtooling and cling to parse and execute C++ code at compile-time. https://github.com/blockspacer/CXXCTP

Related to: https://github.com/root-project/cling/issues/342 https://github.com/bincrafters/community/issues/292

[Croydon]

This depends on LLVM right?

LLVM is still work in progress. See e.g. https://github.com/conan-io/conan-center-index/pull/1450

[blockspacer]

@Croydon Cling uses branch cling-v0.9 from repo "http://root.cern.ch/git/llvm.git" instead of https://github.com/llvm/llvm-project.git LLVM recipe is similar, but not required for cling recipe