Disable NOTZ_TIMEZONE, it breaks in Europe/London during winter time.

Index: lib/Class/Date.pm
--- lib/Class/Date.pm.orig
+++ lib/Class/Date.pm
@@ -47,7 +47,7 @@ $DATE_FORMAT="%Y-%m-%d %H:%M:%S";
 
 sub _set_tz { my ($tz) = @_;
     my $lasttz = $ENV{TZ};
-    if (!defined $tz || $tz eq $NOTZ_TIMEZONE) {
+    if (!defined $tz) {
         # warn "_set_tz: deleting TZ\n";
         delete $ENV{TZ};
         Env::C::unsetenv('TZ') if exists $INC{"Env/C.pm"};