RFR(XS): 8130432: ppc64le: Fix build of hsdis

[Lindenmaier, Goetz]

Hi,

I please need a review and sponsor for this tiny diff.
It's needed to build the hotspot disassembler library on ppc64le.
http://cr.openjdk.java.net/~goetz/webrevs/8130432-hsdis/webrev.01/

Thanks and best regards,
  Goetz.