[cmake] Improve the cmake infrastructure. #1159
Merged
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This patch continues to improve the builds of Clad in the context of the llvm mono repo. It tries to reuse as much infrastructure as possible between the packaged version of llvm and in-tree builds. This is why we have dropped the CLANG_ variable as they are not available in the in-tree builds. We have a good replacement as we always require LLVM and Clang to be in sync and this is the way they are distributed anyway.