Added missing file to the 'make dist' target

src/Makefile.am

@@ -63,6 +63,7 @@ include_HEADERS += black_holes.h black_holes_io.h black_holes_properties.h black
 include_HEADERS += feedback.h feedback_struct.h feedback_properties.h 
 include_HEADERS += space_unique_id.h line_of_sight.h io_compression.h
 include_HEADERS += rays.h rays_struct.h
+include_HEADERS += sink.h sink_struct.h sink_io.h sink_properties.h
 include_HEADERS += particle_splitting.h particle_splitting_struct.h
 include_HEADERS += chemistry_csds.h star_formation_csds.h
 include_HEADERS += mesh_gravity.h mesh_gravity_mpi.h mesh_gravity_patch.h mesh_gravity_sort.h row_major_id.h
@@ -418,7 +419,6 @@ nobase_noinst_HEADERS += sink/Default/sink.h sink/Default/sink_io.h sink/Default
 nobase_noinst_HEADERS += sink/Default/sink_iact.h
 nobase_noinst_HEADERS += sink/GEAR/sink.h sink/GEAR/sink_io.h sink/GEAR/sink_part.h sink/GEAR/sink_properties.h 
 nobase_noinst_HEADERS += sink/GEAR/sink_iact.h
-nobase_noinst_HEADERS += sink.h sink_io.h sink_properties.h
 nobase_noinst_HEADERS += neutrino.h neutrino_properties.h neutrino_io.h
 nobase_noinst_HEADERS += neutrino/Default/neutrino.h neutrino/Default/relativity.h neutrino/Default/fermi_dirac.h
 nobase_noinst_HEADERS += neutrino/Default/neutrino_properties.h neutrino/Default/neutrino_io.h