6345 remove xhat support

*** 400,410 ****
                  xdr_mblk.o      \
                  xdr_mem.o       \
                  xdr.o           \
                  xdr_array.o     \
                  xdr_refer.o     \
-                 xhat.o          \
                  zone.o
  
  #
  #       Stubs for the stand-alone linker/loader
  #
--- 400,409 ----