Remove suppression for now fixed test.

tests/lib/lib.status

Index: tests/lib/lib.status
diff --git a/tests/lib/lib.status b/tests/lib/lib.status
index 33be3ca87f41553ea91a8cf3096b294931e27679..053f62abbf75de08e71ed93b37f5e3d86309db52 100644
--- a/tests/lib/lib.status
+++ b/tests/lib/lib.status
@@ -93,7 +93,6 @@ async/timer_isolate_test: Skip # See Issue 4997
 async/timer_not_available_test: Skip # only meant to test when there is no way to
                                      # implement timer (currently only in d8)
 mirrors/library_uri_io_test: Skip # Not intended for drt as it uses dart:io.
-mirrors/library_uri_package_test: Fail # Returns non-package uri.
 
 [ $arch == arm ]
 *: Skip