build_wrapper: Fix BIN_TARGET_DIRS for iOS on Mac

Also removing unused 'mac-clang-10.8-x64_iOS-iphone' entry

Change-Id: Ice89e947278de825b27942c59686de8a4cf54fa1
Reviewed-by: Iikka Eklund <iikka.eklund@digia.com>
Add Mac iOS offline installer

Change-Id: Id78e5b180f54b61dffe5b7a9995069bb35936b03
Reviewed-by: Iikka Eklund <iikka.eklund@digia.com>