Merge pull request #6174 from haskell/backports-ignore-msg-spdx

Cabal/Distribution/FieldGrammar/Parsec.hs

Cabal/Distribution/SPDX/LicenseExceptionId.hs

Cabal/Distribution/SPDX/LicenseId.hs

Cabal/Distribution/SPDX/LicenseListVersion.hs

Cabal/doc/file-format-changelog.rst

Cabal/tests/ParserTests/regressions/multiple-libs-2.check

Cabal/tests/ParserTests/regressions/multiple-libs-2.format

Cabal/tests/ParserTests/regressions/wl-pprint-indef.format

Cabal/tests/UnitTests/Distribution/SPDX.hs

Makefile

boot/SPDX.LicenseExceptionId.template.hs

boot/SPDX.LicenseId.template.hs

cabal-dev-scripts/src/GenSPDX.hs

cabal-dev-scripts/src/GenSPDXExc.hs

cabal-dev-scripts/src/GenUtils.hs

license-list-data/exceptions-3.6.json

license-list-data/licenses-3.6.json