trim down the number of configurations to build

.regression.yml

@@ -5,13 +5,8 @@ project:
  libtorrent
 
 features:
- - variant=release
- - asserts=production
+ - variant=release asserts=production
  - statistics=on logging=verbose disk-stats=on bandwidth-limit-logging=on dht=logging
- - ipv6=off
- - deprecated-functions=off
- - address-model=32
- - dht=off
- - invariant-checks=off
- - extensions=off
+ - asserts=production ipv6=off dht=off extensions=off logging=off
+ - deprecated-functions=off