[Author: thomasvl]
[Author: thomasvl]

Move the CPP guard before the system headers, they don't all exist on 10.4,
  so compile was failing.

TBR=dmaclach
DELTA=5  (3 added, 2 deleted, 0 changed)
qokelate/google-toolbox-for-mac,qokelate/google-toolbox-for-mac,qokelate/google-toolbox-for-mac