RFR (XS): 8020121: PPC64: fix build in cppInterpreter after 8019519

[Lindenmaier, Goetz]

Hi,

I please need a review for this small change:
http://cr.openjdk.java.net/~goetz/webrevs/8020121-fix_ts/

I broke the build of the cppInterpreter only in the ppc staging
repository by 8019519.  This fixes it again.

Thanks & best regards,
  Goetz.

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