Changes for iOS
Changes for iOS

* cmake 3.3.1 is only required for iOS
The latest version contains several fixes needed for proper
Xcode project generation for iOS
* Main changes involve setting up SDK for iphoneos/simulator
and setting up the right attributes/libs for XCode.

Tested on OS X and iOS device/simulator 32/64 bit

Change-Id: Ifd0ef9dd63ba2436300f1b508dec55496fcaacc0

google/fplbase,google/fplbase,google/fplbase,google/fplbase