REUSE Compliance

Three patch files (clearly indicated in .reuse/dep5) add some new files to the target codebase, and such new files bear SPDX headers with deprecated SPDX license identifiers (GPL-2.0 and GPL-2.0+). Even if the correct license identifiers are used in .reuse/dep5 for such patch files, 'reuse lint' command looks for SPDX headers within source files first, so it returns error, complaining about deprecated license ids. We let reuse check fail for now, since it does not prevent the generation of SPDX SBoM.