cleanup build warnings

1. Change `CyaSSL_OCSP_set_options()` to return `SSL_SUCCESS`
   or `SSL_FAILURE` as `int` like rest of API.
2. Fix data narrowing warning in file io.c function
   `process_http_response()`.
3. Fix global variable shadowed warning in file ssl.c function
   `CyaSSL_GetSessionAtIndex()`
4. Fix data narrowing warning in file internal.c functions
   `Encrypt()` and `Decrypt()`. Passed in a word32 size parameter
   that was provided a word16 and used as a word16.
5. Removed unreachable code from file tls.c function
   `CyaSSL_GetHmacType()`.
6. Fix data narrowing warnings in file aes.c functions
   `AesCcmEncrypt()` and `AesCcmDecrypt()`.

src/io.c

@@ -679,7 +679,8 @@ static int process_http_response(int sfd, byte** respBuf,
         }
         else {
             *end = 0;
-            len -= end - start + 2;
+            len -= (int)(end - start) + 2;
+                /* adjust len to remove the first line including the /r/n */
 
             if (XSTRNCASECMP(start, "HTTP/1", 6) == 0) {
                 start += 9;