Mark BROKEN: fails to build

In file included from /wrkdirs/usr/ports/games/stepmania-devel/work/stepmania-5.0.11/src/ScreenDebugOverlay.cpp:12:
In file included from /wrkdirs/usr/ports/games/stepmania-devel/work/stepmania-5.0.11/src/ScreenGameplay.h:10:
In file included from /wrkdirs/usr/ports/games/stepmania-devel/work/stepmania-5.0.11/src/BeginnerHelper.h:9:
/wrkdirs/usr/ports/games/stepmania-devel/work/stepmania-5.0.11/src/NoteData.h:378:25: error: 'swap<NoteData>' is missing exception specification 'noexcept(is_nothrow_move_constructible<NoteData>::value && is_nothrow_move_assignable<NoteData>::value)'

template<> inline void swap<NoteData>( NoteData &nd1, NoteData &nd2 ) { nd1.swap( nd2 ); }
                       ^

Reported by: pkg-fallout