feat!(quic): Remove gccgo support

Since gccgo is stuck at 1.18 without generics, drop support
sadge

Signed-off-by: Sam Therapy <sam@samtherapy.net>

pkg/resolvers/QUIC.go

@@ -1,5 +1,4 @@
 // SPDX-License-Identifier: BSD-3-Clause
-//go:build !gccgo
 
 package resolvers
 

pkg/resolvers/QUIC_gccgo.go

@@ -1,26 +0,0 @@
-// SPDX-License-Identifier: BSD-3-Clause
-//go:build gccgo
-
-// TODO: Whenever gccgo supports quic-go, delete this
-package resolvers
-
-import (
-	"errors"
-
-	"dns.froth.zone/awl/pkg/util"
-	"github.com/miekg/dns"
-)
-
-// QUICResolver is for DNS-over-QUIC queries.
-type QUICResolver struct {
-	opts *util.Options
-}
-
-var _ Resolver = (*QUICResolver)(nil)
-
-var errNotImplemented = errors.New("DNS-over-QUIC not supported when running gccgo!")
-
-// LookUp cannot be used with gccgo because gccgo does not (and likely will not) support generics.
-func (resolver *QUICResolver) LookUp(msg *dns.Msg) (util.Response, error) {
-	return util.Response{}, errNotImplemented
-}