RFR : 8227869: fix wrong format specifiers in os_aix.cpp

[Baesken, Matthias]

Hello, there are a couple of non matching  format specifiers in os_aix.cpp .
I adjust them with my change .

Please review !

Bug/webrev :

https://bugs.openjdk.java.net/browse/JDK-8227869

http://cr.openjdk.java.net/~mbaesken/webrevs/8227869.0/

Thanks, Matthias
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