internal/rosa/netfilter: fetch libnftnl source via git

Eliminates the xz dependency.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/rosa/netfilter.go

@@ -53,24 +53,24 @@ func init() {
 func (t Toolchain) newLibnftnl() (pkg.Artifact, string) {
 	const (
 		version  = "1.3.1"
-		checksum = "A6EFNv2TbOcjcsXX2hQ-pKsF5FvlSh-BNEf9LrgnVH4nDjcv6NbtyHkTriz9kIEu"
+		checksum = "91ou66K-I17iX6DB6hiQkhhC_v4DFW5iDGzwjVRNbJNEmKqowLZBlh3FY-ZDO0r9"
 	)
-	return t.NewPackage("libnftnl", version, pkg.NewHTTPGet(
-		nil, "https://www.netfilter.org/projects/libnftnl/files/"+
-			"libnftnl-"+version+".tar.xz",
+	return t.NewPackage("libnftnl", version, t.NewViaGit(
+		"https://git.netfilter.org/libnftnl",
+		"refs/tags/libnftnl-"+version,
 		mustDecode(checksum),
 	), &PackageAttr{
-		SourceKind: SourceKindTarXZ,
-
 		Env: []string{
 			"CFLAGS=-D_GNU_SOURCE",
 		},
 	}, &MakeHelper{
+		Generate: "./autogen.sh",
 		Configure: []KV{
 			{"enable-static"},
 		},
 	},
-		XZ,
+		Automake,
+		Libtool,
 		PkgConfig,
 
 		Libmnl,