qbs build: Introduce libclang module.
This is The Right Way to detect libclang. Using a Probe will also slightly improve performance in qbs 1.6 due to the result caching. Change-Id: I063a8d108d02b620dda2df75dd8c014c84f27ec7 Reviewed-by: Joerg Bornemann <firstname.lastname@example.org> Reviewed-by: Nikolai Kosjar <email@example.com>
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