AC_CHECK_TOOL doesn't work with cached values

[Jim Meyering]

As you might have guessed, I've just upgraded the fetish utils to
use the latest versions of autoconf and automake.  Here's another
problem and fix.  I haven't checked this in, but am indeed using it.

        * acgeneral.m4 (AC_CHECK_TOOL): Set $1 also when using the cache.
        Without this change, AC_PROG_RANLIB wouldn't work (wouldn't define
        RANLIB) when ac_cv_prog_RANLIB was defined in the cache.

Assuming someone approves it, you're welcome to check this in.
I may be off-line for a few days.

Index: acgeneral.m4
===================================================================
RCS file: /cvs/autoconf/acgeneral.m4,v
retrieving revision 1.597
diff -u -p -r1.597 acgeneral.m4
--- acgeneral.m4        2000/10/29 19:43:53     1.597
+++ acgeneral.m4        2000/10/29 22:34:16
@@ -3128,6 +3128,8 @@ if test -z "$ac_cv_prog_$1"; then
   ac_ct_$1=$$1
   AC_CHECK_PROG([ac_ct_$1], [$2], [$2], [$3], [$4])
   $1=$ac_ct_$1
+else
+  $1="$ac_cv_prog_$1"
 fi
 ])# AC_CHECK_TOOL