Make pgtype test compat with CockroachDB when possible

pgtype/circle_test.go

@@ -8,6 +8,8 @@ import (
 )
 
 func TestCircleTranscode(t *testing.T) {
+	skipCockroachDB(t, "Server does not support box type")
+
 	testutil.RunTranscodeTests(t, "circle", []testutil.TranscodeTestCase{
 		{
 			pgtype.Circle{P: pgtype.Vec2{1.234, 5.67890123}, R: 3.5, Valid: true},