Log Message:
+ Remove pkgtools/pax and pkgtools/tnftp as they are no longer different
  from archivers/pax and net/tnftp, respectively.  In the past, the
  pkgtools version of these packages installed into ${PKG_TOOLS_BIN},
  but this was changed in:

	pkgtools/pax/Makefile:1.15
	pkgtools/tnftp/Makefile:1.3

+ Get rid of archivers/pax/Makefile.common and net/tnftp/Makefile.common
  by merging them into their respective Makefiles.  The Makefile.common
  files existed solely for inclusion by the pkgtools versions of these
  packages, but with the removal of those packages, these files are
  now unnecessary.

+ Add full DESTDIR support to archivers/pax and net/tnftp.

+ Modify the bootstrap to build archivers/pax and net/tnftp instead of
  the pkgtools versions of these packages.