ABI of debug CPython builds

[pradyunsg]

https://docs.python.org/3/whatsnew/3.8.html#debug-build-uses-the-same-abi-as-release-build

Since Python 3.8, the ABI of debug and release builds of CPython have the same ABI. This implies that we shouldn't be generating the d tags for those builds, since those have the same ABI as regular builds:

packaging/src/packaging/tags.py

Line 147 in 55584fb

debug = "d"

[brettcannon]

Is this true on Windows?