Ryan Liptak d3363b7a61 Replace unreachable with error return for non-standard Windows targets
This new error mirrors the error returned from the Elf struct (error.UnsupportedElfArchitecture):

0adcfd60f4/src/link/Lld.zig (L112)

Before:

```
$ zig build-exe -target riscv64-windows-gnu main.zig
thread 543087 panic: reached unreachable code
```

After:

```
$ zig build-exe -target riscv64-windows-gnu main.zig
error: unable to create compilation: UnsupportedCoffArchitecture
```

Closes #24287
2025-06-29 08:32:19 +02:00
..
2025-03-27 03:49:38 +00:00
2025-06-13 22:05:03 +01:00
2025-03-27 03:49:38 +00:00
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