Modified common MacOS gcc config for iOS compatibility. Added iOS
mkspecs for iOS devices and simulator using G++, LLVM-G++ or CLANG
compilers.
Change-Id: If0a0b1a3ce4e0dc4db319a315e227a9d31549399
Reviewed-by: Morten Johan Sørvig <morten.sorvig@nokia.com>
Reviewed-by: Lars Knoll <lars.knoll@nokia.com>