Pull in iOS cmake toolchain file from https://ios-cmake.googlecode.com/hg/toolchain/iOS.cmake revision dd7a50cd8abc
Removed flag for padding function names, not used for static libraries as required by iOS
Updated to current architectures supported by Xcode. armv6 left for compatibility with old Xcode/hardware which is no longer supported by Xcode or for submission to the AppStore, it will be silently ignored during the build process by Xcode
Easier iPhone project generation, use -DIOS_PLATFORM=OS or -DIOS_PLATFORM=SIMULATOR on cmake command line for iOS builds