We should deprecate -release

[Nicholas Wilson]

On Saturday, 13 July 2024 at 01:55:16 UTC, Steven Schveighoffer 
wrote:
> I think we should remove it. What do you think? Deprecate for 3 
> versions, then remove.

First thing we need to do is go through [the test 
suite](https://github.com/search?q=repo%3Adlang%2Fdmd+%22-release%22+language%3AD&type=code) and determine why (i.e. what bits of its implications) `-release` is required in those tests, and replace it with the switches that need to be tested.

Any help with the archeology much appriciated.