crypto/internal/boring: noescape and nocallback cgo directives result in suspected miscompilation

```
#!watchflakes
default <- builder == "linux-arm64-boringcrypto" && date > "2023-10-22" && date < "2023-10-26"
```

We identified https://go.googlesource.com/go/+/e46e861 to be the culprit for breaking many Google-internal tests (internal bug reference: b/307728752).

I’m sending a revert for now, but this should be investigated in more detail.