mac strip test: Update expectations for Xcode 4 toolchain.

The bots switched to Xcode 4.2 recently. Like a comment in the
test says:

  # The actual numbers here are not interesting, they just need to be the same
  # in both the xcode and the make build.
Review URL: https://codereview.chromium.org/12212154

git-svn-id: http://gyp.googlecode.com/svn/trunk@1570 78cadc50-ecff-11dd-a971-7dbc132099af