Updates #10180

Temporarily disable this test on ppc64 systems as all our builders use 64k page size.

We need a portable way to get the page size of the host so we can correctly size the mmap hole.

Change-Id: Ibd36ebe2f54cf75a44667e2070c385f0daaca481
Reviewed-on: https://go-review.googlesource.com/7652Reviewed-by: Andrew Gerrand <adg@golang.org>