gnutls 2.12.x building fun

[Michael Cronenworth]

To test a possible bug I needed to have 2.12.6.1 built. Using the 
mingw32-2.10.5 spec file I found the following differences:

- libnettle has been chosen as the default crypto lib, but I gave 
configure "--with-libgcrypt"
   to use gcrypt.
- openssl compat dll has an soname bump from 26 to 27
   The .def file is still named 26, though. I will report upstream.
- libgnutlsxx has an soname bump from 26 to 27
- p11tool, a new binary

Just an FYI as I see 2.12 is in rawhide.