Add missing adddf3

```
LLD Link... ld.lld: error: undefined symbol: __aeabi_dadd
>>> referenced by errol.zig:366 (/home/usr/projects/zig/build/lib/zig/std/fmt/errol.zig:366)
```
6de0c622fffrmdstryr committed on 6/22/2022, 12:32:52 PM· committed by Luuk de Gramparentd980c6a
1 file changedLine totals unavailable