darwin version for IOS not work anymore

[rikki cattermole]

On 29/07/2021 2:59 AM, workman wrote:
> version(darwin) {

The darwin version identifier is deprecated.

While it is still supported for OSX by the looks, its not supported for iOS.

https://github.com/ldc-developers/ldc/blob/926db58d5c4aa4ebf0a085cd6a6f2d425cbfbf76/driver/main.cpp#L796

vs

https://github.com/ldc-developers/ldc/blob/926db58d5c4aa4ebf0a085cd6a6f2d425cbfbf76/driver/main.cpp#L837