RFR(XS): 8211097: aix: fix build after JDK-8210919

[Doerr, Martin]

Hi,

we need to fix the build on AIX as suggested by Magnus.

Webrev:
http://cr.openjdk.java.net/~mdoerr/8211097_aix_fix_build_after_8210919/webrev.00/

Please review.

Thanks,
Martin