transform: Move internal identifiers out of private range

Avoid any conflicts if implementations use transform types in the
private range.
Also removed the unused UNKNOWN_TRANSFORM_TYPE identifier.

src/libstrongswan/crypto/transform.h

@@ -29,17 +29,16 @@ typedef enum transform_type_t transform_type_t;
  * Type of a transform, as in IKEv2 RFC 3.3.2.
  */
 enum transform_type_t {
-	UNDEFINED_TRANSFORM_TYPE = 241,
-	HASH_ALGORITHM = 242,
-	RANDOM_NUMBER_GENERATOR = 243,
-	AEAD_ALGORITHM = 244,
-	COMPRESSION_ALGORITHM = 245,
-	EXTENDED_OUTPUT_FUNCTION = 246,
 	ENCRYPTION_ALGORITHM = 1,
 	PSEUDO_RANDOM_FUNCTION = 2,
 	INTEGRITY_ALGORITHM = 3,
 	DIFFIE_HELLMAN_GROUP = 4,
-	EXTENDED_SEQUENCE_NUMBERS = 5
+	EXTENDED_SEQUENCE_NUMBERS = 5,
+	HASH_ALGORITHM = 256,
+	RANDOM_NUMBER_GENERATOR = 257,
+	AEAD_ALGORITHM = 258,
+	COMPRESSION_ALGORITHM = 259,
+	EXTENDED_OUTPUT_FUNCTION = 260,
 };
 
 /**