Prune version constants.

SSL3_VERSION_MAJOR is the only MAJOR/MINOR number used internally or
externally.

Change-Id: I3f17175e73fd89887665accf1bfa680581f42dfe
Reviewed-on: https://boringssl-review.googlesource.com/4790
Reviewed-by: Adam Langley <agl@google.com>

include/openssl/ssl.h

@@ -181,21 +181,12 @@ OPENSSL_EXPORT int SSL_library_init(void);
 
 /* Protocol version constants */
 
-#define SSL3_VERSION 0x0300
 #define SSL3_VERSION_MAJOR 0x03
-#define SSL3_VERSION_MINOR 0x00
-
-#define TLS1_2_VERSION 0x0303
-#define TLS1_2_VERSION_MAJOR 0x03
-#define TLS1_2_VERSION_MINOR 0x03
-
-#define TLS1_1_VERSION 0x0302
-#define TLS1_1_VERSION_MAJOR 0x03
-#define TLS1_1_VERSION_MINOR 0x02
 
+#define SSL3_VERSION 0x0300
 #define TLS1_VERSION 0x0301
-#define TLS1_VERSION_MAJOR 0x03
-#define TLS1_VERSION_MINOR 0x01
+#define TLS1_1_VERSION 0x0302
+#define TLS1_2_VERSION 0x0303
 
 #define DTLS1_VERSION 0xFEFF
 #define DTLS1_2_VERSION 0xFEFD