fix ossl 1.1.0

Author: qmuntal

ec.go

@@ -22,6 +22,11 @@ func SupportsCurve(curve string) bool {
 }
 
 var supportsX25519 = sync.OnceValue(func() bool {
+	if !versionAtOrAbove(1, 1, 1) {
+		// X25519 support was added in OpenSSL 1.1.0, but the APIs we use
+		// to implement it were only added in 1.1.1.
+		return false
+	}
 	ctx, _ := ossl.EVP_PKEY_CTX_new_id(ossl.EVP_PKEY_X25519, nil)
 	if ctx != nil {
 		ossl.EVP_PKEY_CTX_free(ctx)