hg: jigsaw/m2/jdk: Remove TestExtcheckArgs.java from exclude list as extcheck is now gone

[alan . bateman]

Changeset: 714a24cbca80
Author:    alanb
Date:      2014-11-08 12:26 +0000
URL:       http://hg.openjdk.java.net/jigsaw/m2/jdk/rev/714a24cbca80

Remove TestExtcheckArgs.java from exclude list as extcheck is now gone

! test/ProblemList.txt