abuild: add licence exclusions

Closed Ghost User requested to merge (removed):lint-licence into master

some software is public domain but spdx does not contain an identifier
for this, which means all of them needlessly throw lint errors

some other software has a custom yet non-spdx identified licence, and
the same applies

this should silence the lint warnings for these two cases. yes, there is a (undocumented in APKBUILD(5)) !spdx, but this disables all checks- something might be some_license OR custom, etc

Edited by Ghost User

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