update: use boring package not global var

Align with the upstream to use `boring` as a name for a package. No functional changes.

cipher_suites.go

@@ -19,6 +19,7 @@ import (
 	"hash"
 	"runtime"
 
+	"github.com/refraction-networking/utls/internal/boring"
 	"golang.org/x/sys/cpu"
 
 	"golang.org/x/crypto/chacha20poly1305"

internal/boring/notboring.go

@@ -0,0 +1,16 @@
+package boring
+
+import (
+	"crypto/cipher"
+	"errors"
+)
+
+const Enabled bool = false
+
+func NewGCMTLS(_ cipher.Block) (cipher.AEAD, error) {
+	return nil, errors.New("boring not implemented")
+}
+
+func Unreachable() {
+	// do nothing
+}

notboring.go

@@ -3,11 +3,6 @@
 // license that can be found in the LICENSE file.
 package tls
 
-import (
-	"crypto/cipher"
-	"errors"
-)
-
 func needFIPS() bool { return false }
 
 func supportedSignatureAlgorithms() []SignatureScheme {
@@ -20,20 +15,3 @@ func fipsCurvePreferences(c *Config) []CurveID { panic("fipsCurvePreferences") }
 func fipsCipherSuites(c *Config) []uint16      { panic("fipsCipherSuites") }
 
 var fipsSupportedSignatureAlgorithms []SignatureScheme
-
-// [uTLS]
-// Boring struct is only to be used to record static env variables
-// in boring package. We do not implement BoringSSL compatibliity here.
-type Boring struct {
-	Enabled bool
-}
-
-func (*Boring) NewGCMTLS(_ cipher.Block) (cipher.AEAD, error) {
-	return nil, errors.New("boring not implemented")
-}
-
-func (*Boring) Unreachable() {
-	// do nothing
-}
-
-var boring Boring