Simplify the compilation to default cmmi

Removed already incorporated patch.

Keep old version and use it with software which needs it.

Patch has been adapted to the new version.

Relax Via string and define it once in caddy-frontend.

Now that slapos.core on python2 can use softwares on python3, we no
longer need to test for python2

when using golang 1.17 build fail with errors like:

    github.com/jacobsa/fuse/internal/buffer.memclr: relocation target runtime.memclrNoHeapPointers not defined for ABI0 (but is defined for ABIInternal)