ENH: adding macro to supress unused parameters

Code/Common/otbMacro.h

@@ -222,4 +222,6 @@ namespace otb
       } \
     }
 
+#  define otbUnusedMacro(x) (void)x;
+
 #endif //end of otbMacro.h

Code/UtilitiesAdapters/CurlAdapters/otbCurlHelper.cxx

@@ -352,6 +352,8 @@ int CurlHelper::RetrieveFileMulti(const std::vector<std::string>& listURLs,
                                   const std::vector<std::string>& listFilename,
                                   int maxConnect) const
 {
+
+  otbUnusedMacro(maxConnect);
 #ifdef OTB_USE_CURL
 #if 0
 //#ifdef OTB_CURL_MULTI_AVAILABLE
@@ -533,6 +535,8 @@ size_t CurlHelper::CallbackWriteDataToStringStream(void *ptr, size_t size, size_
 
 size_t CurlHelper::CallbackWriteDataDummy(void *ptr, size_t size, size_t nmemb, void *data)
 {
+  otbUnusedMacro(ptr);
+  otbUnusedMacro(data);
   return size * nmemb;
 }