RFR(S): 8175087: [bsd] Fix build after "8024900: PPC64: Enable new build on AIX (jdk part)"

[Lindenmaier, Goetz]

Hi,

Please review this tiny fix.  There is a BSD specific section of this code
so the code guarded by the #if I fixed may not be compiled on bsd.
http://cr.openjdk.java.net/~goetz/wr17/8175087-macErr/webrev.01/

Best regards,
  Goetz.