revert timeout change

It looks like "timeout" doens't work on some machines...

  +sh: /usr/bin/timeout: /lib/ld-linux.so.2: bad ELF interpreter: No such file or directory

hphp/test/run

@@ -375,8 +375,6 @@ function run($options, $tests, $bad_test_file) {
 
 function run_test($options, $test) {
   $hhvm = hhvm_cmd($options, $test);
-  // timeout doesn't proxy the exit code, but we don't care
-  $hhvm = "/usr/bin/timeout 60 $hhvm";
   $output = "";
   if (isset($options['repo'])) {
     if (strpos($test, '.hhas') !== false || strpos($hhvm, '-m debug') != false || is_file($test.'.norepo')) {