Add sw_64 support for dnf

[kalmdy]

Add sw_64 support for dnf

[Conan-Kudo]

What is sw_64?

[m-blaha]

Anyway, whatever sw_64 architecture is (maybe https://en.wikipedia.org/wiki/Sunway_(processor) ?), you need to make sure it's also supported by these two underlying layers of libraries:

1. libsolv (check https://github.com/openSUSE/libsolv/blob/master/src/poolarch.c)
2. libdnf (see https://github.com/rpm-software-management/libdnf/blob/dnf-4-master/libdnf/dnf-context.cpp)

[Conan-Kudo]

It also needs to be supported in RPM. It currently is not.