Regen bsd.gcc.mk diff, fix Uses/compiler.mk
Prune 9 obsolete ports

FreeBSD Ports maintainers have already deleted the following:
  games/nethack33-gnome
  games/nethack34-gnome
  math/vtk-data
  math/vtk-examples
  math/vtk-headers
  math/vtk-java
  math/vtk-python
  math/vtk-tcl
  science/mayavi
asterisk14: exclude DAHDI option