[dist] Don't configure directories that aren't distributed.

These four directories are not included in their respective SUBDIRS,
which means they aren't built and aren't included in the distribution
tarball.  configure.ac still tries to generate their Makefiles,
though, which causes configure failures when run from the dist
tarball:

  config.status: error: cannot find input file: `src/tet3/inetlib/Makefile.in'
  config.status: error: cannot find input file: `src/tet3/servlib/Makefile.in'
  config.status: error: cannot find input file: `xts5/src/libXtaw/Makefile.in'
  config.status: error: cannot find input file: `xts5/src/libXtmu/Makefile.in'

Fix this by just deleting those line.  The corresponding Makefiles
aren't used.

Signed-off-by: Aaron Plattner <aplattner@nvidia.com>

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