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