Warning fix for automake on CVS Libtool

[Pavel Roskin]

Hello!

This patch eliminates pushing undefined values to an array of suffixes to
be cleaned for texinfo files.

This fixes the warnings automake produces when it's run on the CVS
Libtool sources.

ChangeLog:
        * automake.in (scan_texinfo_file): Don't push undefined values
        to @clean_suffixes.

_______________________
--- automake.in
+++ automake.in
@@ -2596,11 +2596,13 @@
       # Storing in a predefined index.
       elsif (/^\@([cfkvtp])index /)
       {
-        push @clean_suffixes, $predefined_index{$1};
+        push @clean_suffixes, $predefined_index{$1}
+         if (defined $predefined_index{$1});
       }
       elsif (/address@hidden(\w+) /)
       {
-        push @clean_suffixes, $hidden_index{$1};
+        push @clean_suffixes, $hidden_index{$1}
+         if (defined $hidden_index{$1});
       }

       # Merging an index into an another.
_______________________

-- 
Regards,
Pavel Roskin