Fix test for work with Perl 5.8.9-alt3

Persistent __DATA__ section seems to be broken now.

--- ./t/data.plx

+++ ./t/data.plx

@@ -1,8 +1,6 @@

 #!perl -w

-print <DATA>;

-__DATA__

-This is a test.

-

-If this were a real program beer would have fallen from the overhead

-containers.

+print "This is a test.\n";

+print "\n";

+print "If this were a real program beer would have fallen from the overhead\n";

+print "containers.\n";