m2 packages are used as build tools for building packages on windows systems. These packages use the msys2 runtime, a modified Cygwin runtime and therefore downstream conda packages should not link to these packages.

Downstream packages should link to the m2w64 packages which used msvcrt runtime and now use ucrt runtime.

We package m2 x86_64 packages for both win-64 and win-arm64 platforms as win-arm64 can run x86_64 binaries and since there are no arm64 msys2 packages.