gnutls: Update to 3.7.4

gnutls: Update to 3.7.4

Bump to latest upstream release.  Rebased existing patches.

This version introduces certificate compression support, and with that,
optional dependencies on zlib and zstd. When configure picks them up,
build will fail due to missing dependencies:

Package libgnutls is missing dependencies for the following libraries:
libz.so.1
libzstd.so.1

Disable zlib and zstd support to avoid that.

Signed-off-by: John Audia <graysky@archlinux.us>
[disable zlib and zstd]
Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>