Move the C++ protection

include/chameleon/runtime_struct.h

@@ -25,8 +25,6 @@
 
 #include "chameleon/types.h"
 
-BEGIN_C_DECLS
-
 /**
  * Datatype for distributed version
  */
@@ -41,6 +39,8 @@ typedef uintptr_t MPI_Comm;
 #endif
 #endif
 
+BEGIN_C_DECLS
+
 /**
  * @brief Ids of the runtime supported by the RUNTIME API
  */