Add JSON.pm to third_party

third_party/JSON/JSON-2.59/t/e16_incr_parse_fixed.t

+#!/usr/bin/perl
+
+BEGIN {
+    $ENV{ PERL_JSON_BACKEND } = $ARGV[0] || 'JSON::backportPP';
+}
+
+use strict;
+use Test::More tests => 4;
+
+use JSON;
+
+my $json = JSON->new->allow_nonref();
+
+my @vs = $json->incr_parse('"a\"bc');
+
+ok( not scalar(@vs) );
+
+@vs = $json->incr_parse('"');
+
+is( $vs[0], "a\"bc" );
+
+
+$json = JSON->new;
+
+@vs = $json->incr_parse('"a\"bc');
+ok( not scalar(@vs) );
+@vs = eval { $json->incr_parse('"') };
+ok($@ =~ qr/JSON text must be an object or array/);
+