fix archive

spdxalien returned an error here because it found an empty .scancode.spdx file for mobile-broadband-provider-info-20220725-r0.

That is due to the fact that scancode was launched against an empty __unpacked dir, which in turn is due to the fact that the internal archive for that package doesn't have a root/main folder inside (like mobile-broadband-provider-info-20220725/) but all files are archived in ./; since the tar command is always invoked with --strip 1 option (assuming that a root/main folder is always present), in case like this it may generate the above chain of errors.

Fix #91 (closed)