Specify `std' namespace for remove function (#4268)

src/idl_parser.cpp

@@ -1375,7 +1375,7 @@ CheckedError Parser::StartStruct(const std::string &name, StructDef **dest) {
   struct_def.file = file_being_parsed_;
   // Move this struct to the back of the vector just in case it was predeclared,
   // to preserve declaration order.
-  *remove(structs_.vec.begin(), structs_.vec.end(), &struct_def) = &struct_def;
+  *std::remove(structs_.vec.begin(), structs_.vec.end(), &struct_def) = &struct_def;
   *dest = &struct_def;
   return NoError();
 }