It is now possible to run e.g.
make bin/rtl8139.dsk.licence
in order to see a licensing assessment for any given gPXE build. The
assessment will either produce a single overall licence for the build
(based on combining all the licences used within the source files for
that build), or will exit with an error stating why a licence
assessment is not possible (for example, if there are files involved
that do not yet contain an explicit FILE_LICENCE() declaration).
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