Better user_search_path management

[Gary V . Vaughan]

I need this patch to implement the -M switch (insert new module search 
directory) cleanly for M4-1.5.

Without this patch, doing anything but appending new search directories to 
the user search path involves copying the current path, manually munging a 
copy of the returned string to insert the new component and resetting the 
original path to the newly munged value with lt_dlsetsearchdir().

Now we can insert a new component at any juncture within user_search_path().

No test regressions on my box.  Okay to commit?

Cheers,
        Gary.
-- 
  ())_. Gary V. Vaughan     gary@(oranda.demon.co.uk|gnu.org)
  ( '/  Research Scientist  http://www.oranda.demon.co.uk       ,_())____
  / )=  GNU Hacker          http://www.gnu.org/software/libtool  \'      `&
`(_~)_  Tech' Author        http://sources.redhat.com/autobook   =`---d__/

2001-08-13-gvv-lt_dlinsertsearchdir.patch
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