Pls review 7142586: Cannot build on Solaris 11 due to use of ia_nice [XS]

[Paul Hohensee]

Webrev here

http://cr.openjdk.java.net/~phh/7142586.00/

My fix for

7082553: Interpret Thread.setPriority(Thread.MAX_PRIORITY) to mean FX60
                 on Solaris 10 and 11

mistakenly reintroduced the use of ia_nice from iapriocntl.h.  ia_nice was
removed from Solaris 11 some time ago, so the reference must be removed
in order to build Hotspot on Solaris 11.

Thanks,

Paul