Some SSL_OP_ values can't be used in 1.1.x

SSL_OP_ALL was set in 0x0BFF so reusing some of these bits would cause
ABI compatibility issues.
Reviewed-by: NRich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/3833)

include/openssl/ssl.h

@@ -282,10 +282,25 @@ typedef int (*SSL_custom_ext_parse_cb_ex) (SSL *s, unsigned int ext_type,
 /* Typedef for verification callback */
 typedef int (*SSL_verify_cb)(int preverify_ok, X509_STORE_CTX *x509_ctx);
 
+/*
+ * Some values are reserved until OpenSSL 1.2.0 because they were previously
+ * included in SSL_OP_ALL in a 1.1.x release.
+ *  
+ * Reserved value (until OpenSSL 1.2.0)                  0x00000001U
+ * Reserved value (until OpenSSL 1.2.0)                  0x00000002U
+ */
 /* Allow initial connection to servers that don't support RI */
 # define SSL_OP_LEGACY_SERVER_CONNECT                    0x00000004U
+
+/* Reserved value (until OpenSSL 1.2.0)                  0x00000008U */
 # define SSL_OP_TLSEXT_PADDING                           0x00000010U
+/* Reserved value (until OpenSSL 1.2.0)                  0x00000020U */
 # define SSL_OP_SAFARI_ECDHE_ECDSA_BUG                   0x00000040U
+/*
+ * Reserved value (until OpenSSL 1.2.0)                  0x00000080U
+ * Reserved value (until OpenSSL 1.2.0)                  0x00000100U
+ * Reserved value (until OpenSSL 1.2.0)                  0x00000200U
+ */
 
 /* In TLSv1.3 allow a non-(ec)dhe based kex_mode */
 # define SSL_OP_ALLOW_NO_DHE_KEX                         0x00000400U