boost: respect prefer_static when selecting libraries - #16081
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Fixes #15458.
When
staticis omitted, Boost keeps both static and shared candidates, but ABI selection did not account for the effective library preference.Select the first ABI set that fully covers the requested binary modules, trying the preferred library type before the fallback type. Explicit
staticselection remains strict, and header-only modules donot affect completeness.
The regression test covers both preferences, explicit selection, single-variant fallback, header-only modules, and incomplete-preferred/complete-fallback sets.