(slurp): Remove any occurrences of $bt from the generated gnulib.mk

bootstrap

@@ -478,7 +478,7 @@ slurp() {
       done
       if test $file = Makefile.am; then
         copied=$copied${sep}gnulib.mk; sep=$nl
-	remove_intl='/^[^#].*\/intl/s/^/#/'
+	remove_intl='/^[^#].*\/intl/s/^/#/;'"s,/$bt,,g"
         sed "$remove_intl" $1/$dir/$file | cmp -s - $dir/gnulib.mk || {
 	  echo "$0: Copying $1/$dir/$file to $dir/gnulib.mk ..." &&
 	  rm -f $dir/gnulib.mk &&