Fix compilation against iOS 7 deployment target.
Fix compilation against iOS 7 deployment target.

DELTA=35 (34 added, 0 deleted, 1 changed)
DELTA_BY_EXTENSION=m=35

git-svn-id: de279663232b6350d3cffc59c8efba27ad613299@682 7dc7ac4e-7543-0410-b95c-c1676fc8e2a3

Chilledheart/google-toolbox-for-mac,lxcid/google-toolbox-for-mac,innerfence/google-toolbox-for-mac,sbentzen/Google-Toolbox-for-Mac,lxcid/google-toolbox-for-mac,innerfence/google-toolbox-for-mac,Chilledheart/google-toolbox-for-mac,innerfence/google-toolbox-for-mac,Chilledheart/google-toolbox-for-mac,sbentzen/Google-Toolbox-for-Mac,lxcid/google-toolbox-for-mac,sbentzen/Google-Toolbox-for-Mac