Cannot build distribution-friendly wheels

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### Describe the bug

Since https://github.com/aio-libs/yarl/pull/1586 the default builds are "release" (`-g0 -Ofast -NDEBUG -s`) or "debug" (`-g3 -Og ...`).

However, all Linux distributions and probably others such as homebrew and macports, don't build like this at all.

The standard behaviour for Linux is to build with something along the lines of `-g -O2` and then split the debug symbols into separate packages, so out of the box the binaries are optimised enough and debug symbols that mostly work are easily available.

The usual way we do this is by setting `CFLAGS` to the flags we want, and expecting packages to follow them. Whilst I respect your desire for the binary wheels you ship to be built in fully optimised, is there a way to opt out of this behaviour?

### To Reproduce

Build yarl, expect debug symbols in the binary.

### Expected behavior

Yarl will respect CFLAGS/LDFLAGS and not forcibly add its own flags.

### Logs/tracebacks

```python-traceback
N/A
```

### Python Version

```console
$ python --version
```

### multidict Version

```console
$ python -m pip show multidict
```

### propcache Version

```console
$ python -m pip show propcache
```

### yarl Version

```console
$ python -m pip show yarl
```

### OS

Linux

### Additional context

_No response_