M src/wp/ptbl/xp/Makefile
  M src/wp/ptbl/xp/pd_Style.h
  M src/wp/ptbl/xp/pt_PT_Append.cpp
  A src/wp/ptbl/xp/pt_PT_Styles.cpp
  M src/wp/ptbl/xp/pt_PieceTable.cpp
  M src/wp/ptbl/xp/pt_PieceTable.h
  M src/wp/ptbl/xp/pt_Types.h
You should only need to rebuild the ptbl subtree for this change.   
No, they still don't do anything user-visible. 
Paul