Fix an issue with disabling zlib and getting linker errors from the http client. (#247)

* (http client) #ifdefs so we dont try to compress http requests with zlib

* (http client) Remove some #ifdefs for including zlib and removing fields

ixwebsocket/IXHttpClient.cpp

@@ -204,11 +204,13 @@ namespace ix
         if (verb == kPost || verb == kPut || verb == kPatch || _forceBody)
         {
             // Set request compression header
+#ifdef IXWEBSOCKET_USE_ZLIB
             if (args->compressRequest)
             {
                 ss << "Content-Encoding: gzip"
                    << "\r\n";
             }
+#endif
 
             ss << "Content-Length: " << body.size() << "\r\n";
 
@@ -580,10 +582,12 @@ namespace ix
                 multipartBoundary, httpFormDataParameters, httpParameters);
         }
 
+#ifdef IXWEBSOCKET_USE_ZLIB
         if (args->compressRequest)
         {
             body = gzipCompress(body);
         }
+#endif
 
         return request(url, verb, body, args);
     }