gaul: regenerate configure for linux build as well

[chenrui333]

gaul: add explicit --build flag for linux arm build

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• Tracking issue for Linux ARM bottling #211761

[fxcoudert]

I see a few ways to handle this:

1. autoreconf probably is the cleaner way; it should never hurt, really, and the dependencies it introduces are only build deps
2. passing --build explicitly
3. We could also handle it in brew: when we unpack sources or resources, on aarch64-linux only, when they contain an outdated config.guess or config.sub, replace them with a fixed version.

They are in decreasing order of preference, for me. Option 3 would be useful if we have hundreds of affected formulas.