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[llvmbuild] Add optional_libraries, i.e. a dependency iff the target is enabled
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Authored by dsanders on Jun 12 2020, 4:55 PM.

Details

Summary

Optional dependencies are promoted to required dependencies if the specified
library is enabled via --enable-optional-components or enabled_component = 1,
or dropped if the specified library is disabled. Of course, another mechanism
(such as preprocessor macros) needs to be used so that there are no unresolved
symbols.

It's a warning to specify a library that's not optional in optional_libraries.
Such a dependency will be treated as if it were provided via required_libraries.

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