Fix compilation with GCC 4.9
Fix compilation with GCC 4.9

realm/realm-js,realm/realm-dotnet,realm/realm-core,realm/realm-js,Shaddix/realm-dotnet,realm/realm-object-store,realm/realm-js,Shaddix/realm-dotnet,realm/realm-object-store,realm/realm-js,realm/realm-js,realm/realm-dotnet,realm/realm-js,realm/realm-core,Shaddix/realm-dotnet,realm/realm-core,realm/realm-js,realm/realm-core,realm/realm-js,realm/realm-core,realm/realm-core,realm/realm-dotnet,Shaddix/realm-dotnet,realm/realm-core,realm/realm-js,realm/realm-object-store