avoiding C++, Fortran tags

[Thien-Thi Nguyen]

hello libtool folks,

i recently swiched to libtool 1.5 and now AC_PROG_LIBTOOL pulls in a
horrendous amount of irrelevant checks for C++ and Fortran.  to work
around this, i have resorted to doing:

  aclocal
  echo 'AC_DEFUN([_LT_AC_TAGCONFIG],[])' >> aclocal.m4

probably it's better to call it a kludge and thus this question: are
there plans to extend AC_PROG_LIBTOOL to specify which, if any, tags
are to be included/omitted?  should i elevate this in my mind from
kludge to "acceptable methodology"?

fyi, the above change reduces `configure' script size from 800 to 500
kB -- big win IMHO.

thi