Add ${c,cxx}.deduplicate_export_libs() function

This function deduplicates interface library dependencies by removing
libraries that are also interface dependencies of the specified
libraries. This can result in significantly better build performance for
heavily interface-interdependent library families (for example, like Boost).

Typical usage:

import intf_libs = ...
import intf_libs += ...
...
import intf_libs += ...
intf_libs = $cxx.deduplicate_export_libs($intf_libs)

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