graphics/silgraphite: mark broken on current

In file included from ../src/segment/Segment.cpp:19:
In file included from ../src/segment/Main.h:31:
In file included from ../include/graphite/GrCommon.h:26:
In file included from /usr/include/c++/v1/cstdlib:85:
In file included from /usr/include/c++/v1/stdlib.h:100:
In file included from /usr/include/c++/v1/math.h:311:
/usr/include/c++/v1/type_traits:3699:9: error: no matching constructor for initialization of 'gr3ooo::Segment'

_Tp __t(_VSTD::move(__x));
    ^   ~~~~~~~~~~~~~~~~