Add some spelling words. Make local_versionsync fail gracefully (instead of

planning twice) if File::Slurp isn't found.  Make spelling skip all tests
if Test::Spelling isn't found.

t/00_local_versionsync.t

@@ -5,12 +5,14 @@
 use warnings;
 use strict;
 use File::Find;
-use Test::More qw(no_plan);
+use Test::More;
 
 eval "use File::Slurp";
 plan skip_all => "File::Slurp required for testing version sync"
     if $@;
 
+plan qw(no_plan);
+
 my $last_version = undef;
 find({wanted => \&check_version, no_chdir => 1}, 'blib');
 if (! defined $last_version) {