Add JSON.pm to third_party

third_party/JSON/JSON-2.59/lib/JSON/backportPP/Boolean.pm

Index: third_party/JSON/JSON-2.59/lib/JSON/backportPP/Boolean.pm
diff --git a/third_party/JSON/JSON-2.59/lib/JSON/backportPP/Boolean.pm b/third_party/JSON/JSON-2.59/lib/JSON/backportPP/Boolean.pm
new file mode 100644
index 0000000000000000000000000000000000000000..38be6a3817b3b3b5632f4ee6bd3bba7397af567e
--- /dev/null
+++ b/third_party/JSON/JSON-2.59/lib/JSON/backportPP/Boolean.pm
@@ -0,0 +1,27 @@
+=head1 NAME
+
+JSON::PP::Boolean - dummy module providing JSON::PP::Boolean
+
+=head1 SYNOPSIS
+
+ # do not "use" yourself
+
+=head1 DESCRIPTION
+
+This module exists only to provide overload resolution for Storable
+and similar modules. See L<JSON::PP> for more info about this class.
+
+=cut
+
+use JSON::backportPP ();
+use strict;
+
+1;
+
+=head1 AUTHOR
+
+This idea is from L<JSON::XS::Boolean> written by
+Marc Lehmann <schmorp[at]schmorp.de>
+
+=cut
+