Fix typo which causes test "m4_warn (bad categories)" to fail.

* lib/Autom4te/Channels.pm (report_bad_channel): Fix warning
  message so that it refers to autom4te instead of automake.
* build-aux/fetch.pl (fetch): Replace automake with autom4te in
  warning messages.

Copyright-paperwork-exempt: Yes
Co-authored-by: Kamila Szewczyk <szewczyk@cs.uni-saarland.de>

build-aux/fetch.pl

diff --git a/build-aux/fetch.pl b/build-aux/fetch.pl
index 8b77f2d..40a0ee9 100755
--- a/build-aux/fetch.pl
+++ b/build-aux/fetch.pl
@@ -226,6 +226,7 @@
   # don't use \s here or it will eat blank lines
   $content =~ s/[ \t]+$//gm;
   $content =~ s/\bAutomake::/Autom4te::/g if $edit;
+  $content =~ s/\bautomake\s+--help/autom4te --help/g if $edit;
 
   replace_if_change ($destpath, $content, $quiet);
 }

lib/Autom4te/Channels.pm

diff --git a/lib/Autom4te/Channels.pm b/lib/Autom4te/Channels.pm
index 9138c78..d4c0464 100644
--- a/lib/Autom4te/Channels.pm
+++ b/lib/Autom4te/Channels.pm
@@ -686,7 +686,7 @@
       # don't treat those cases as errors.
       $report_as = 'obsolete';
       $message = "use of $q_channel as a diagnostic category is obsolete\n";
-      $message .= "(see automake --help for a list of valid categories)";
+      $message .= "(see autom4te --help for a list of valid categories)";
     }
   elsif ($channel eq 'none'
          || ($channel =~ /^no-/ && exists $channels{substr($channel, 3)}))