* instead of 3 configure options: --enable-external-clisp,

  --enable-clisp-path, --enable-clisp-dir there is now only one:
  --with-external-clisp[=PATH] which, when used, asks to use an
  external clisp, which is searched in $PATH, or it is possible
  to supply an absolute location if it is not in $PATH.

* the former --enable-clisp-dir option is removed; instead, we use
  a robust way to determine CLISP library directory by calling

  clisp -q -norc -x '(progn (princ *lib-directory*) (values))'

  (this is borrowed from the Meta-CVS package, referenced at
  http://www.niksula.cs.hut.fi/~tsiivola/clisp-ffi-howto.html)

* the configure script performs better checking of clisp
  availability and shows proper errors when needed.

* added the --enable-tetex-build option which is used for the
  texlive builds, and installs the files at the texlive-specific
  locations. added corresponding support to the user-commands
  scripts (xindy, xindy.v2, texindy), to allow them locate
  xindy.{run,mem} and runtime *.xdy modules in the texlive layout.

* do not fail if clisp-link shell script exists but is not
  executable, as it happens in some distributions. instead, call
  it via "sh".


git-svn-id: svn://tug.org/texlive/trunk@7067 c570f23f-e606-0410-a88d-b1316a301751

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