strip -Werror: all specific or none (#30284)

Add a config option to strip `-Werror*` or `-Werror=*` from compile lines everywhere.

```yaml
config:
    keep_werror: false
```

By default, we strip all `-Werror` arguments out of compile lines, to avoid unwanted
failures when upgrading compilers.  You can re-enable `-Werror` in your builds if
you really want to, with either:

```yaml
config:
    keep_werror: all
```

or to keep *just* specific `-Werror=XXX` args:

```yaml
config:
    keep_werror: specific
```

This should make swapping in newer versions of compilers much smoother when
maintainers have decided to enable `-Werror` by default.

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