Heads up: GnuTLS 3.1.7 landing soon

[Michael Cronenworth]

Hi all,

GnuTLS 3.x has been "cleared" for native so I'm building it for MinGW.

There are a few new dependencies that have ABI bumps:
- nettle 2.5
- libtasn1 3.1

The ABI version has been bumped on GnuTLS as well.

A few caveats:
- I've turned off OpenSSL compatibility to match native.
- ECC support is removed like native.

The updated packages (nettle, libtasn1, and gnutls) will be landing in 
rawhide for MinGW in the next few days.

Dependencies:
mingw-glib-networking
mingw-gvnc
mingw-libvirt

Thanks,
Michael