1) update the port to version 1.25: 2) removed files/patch-main::dlist.cc
which is no longer necessary since appropriate code has been added to
the distribution. 3) updated files/patch-aa to use the recently added
Mk/bsd.port.mk PTHREAD_{LIBS,CFLAGS}. Updated the port's Makefile
accordingly 4) "un"echo"ed" post-install