While we initially wanted to just disable the functionality the way it
is currently built forces people to do a full build of Qt just to enable
it. Instead of doing this half-measure let's just remove the code
completely from QtBase and rather prepare QtNetwork to handle being a
plugin that can be compiled at any time.
Task-number: QTBUG-80340
Change-Id: I19155c8c167cf932088f01b2a9706d0e7ab792d1
Reviewed-by: Alex Blasche <alexander.blasche@qt.io>