RFR[9](XXS): 8037013: [TESTBUG] Fix test/java/lang/ClassLoader/Assert.sh on AIX

[Volker Simonis]

Hi,

could you please review the following trivial change which adds AIX to
the list of known OSs in test/java/lang/ClassLoader/Assert.sh:

https://bugs.openjdk.java.net/browse/JDK-8037013
http://cr.openjdk.java.net/~simonis/webrevs/8037013/

Thank you and best regards,
Volker