gnutls: new version (3.7.4)
gnutls: new version (3.7.4)

Signed-off-by: Git for Windows Build Agent <5a4fe08359c7f97380e408c717ef42c86939cd86@git-for-windows.build>

git-for-windows/MSYS2-packages,git-for-windows/MSYS2-packages,dscho/MSYS2-packages,dscho/MSYS2-packages,dscho/MSYS2-packages,git-for-windows/MSYS2-packages,dscho/MSYS2-packages,git-for-windows/MSYS2-packages