Disable getrusage when building LLVM w/ newlib for now.
Disable getrusage when building LLVM w/ newlib for now.

It wasn't using getrusage before, but a change to libnacl
made configure think that it's available.  Unfortunately
it doesn't compile because it's not declared in headers.

Eventually, we'll have a newlib header w/ getrusage, so the
code will at least compile.

BUG=https://code.google.com/p/nativeclient/issues/detail?id=3657
R=dschuff@chromium.org, phosek@chromium.org

Review URL: https://codereview.chromium.org/23792003

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@12088 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client