Attempt to fix a clang issue

source/App/EncoderApp/EncAppCfg.cpp

@@ -35,6 +35,12 @@
     \brief    Handle encoder configuration parameters
 */
 
+#if JVET_O0549_ENCODER_ONLY_FILTER
+#include <map>
+template <class T1, class T2>
+static inline std::istream& operator >> (std::istream &in, std::map<T1, T2> &map);
+#endif
+
 #include "EncAppCfg.h"
 
 #include <stdio.h>