D8780: Try `llvm-config` to find `libclang`

[Alex Turbov]

turbov created this revision.
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REVISION SUMMARY
  The current way to search for `libclang` doesn't work for me (Gentoo with clang 4 and 5 installed). 
  Instead of "brute force", here is a "legal" way (at least for Linux distros) -- use `llvm-config` first, then "fallback" to the old way.
  
  BTW, the problem w/ the old-way in the used (expected) library name `libclang-X.Y`... actually, I never seen that name used (which distro it is?)
  
  PS. This is my first patch on the way to make python binding generation works for me (Gentoo). This is what I intended to make it work, cuz want to port Python host plugin to `kate5`.

REPOSITORY
  R240 Extra CMake Modules

REVISION DETAIL
  https://phabricator.kde.org/D8780

AFFECTED FILES
  find-modules/FindPythonModuleGeneration.cmake

To: turbov
Cc: #frameworks, #build_system
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