debian: remove SRV support
Remove the SRV support patch series. Server admins couldn't rely on
it since non-Debian systems don't have these patches applied. Using
DNS in this way for client-side load balancing can produce good
results but is complex to set up well. Server-side load balancing
reverse proxies plus GeoDNS can work almost as well, with a simpler
setup.
Removing these patches will have very little user-visible performance
effect. Requests with a broken DNS server become faster because we
don't have to wait for a timeout. It brings Debian closer to standard
Git and makes testing by Debian users more useful for upstream Git
development.
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>