scripts/meson_exe: fix stdout and stderr decoding

1. use `locale.getpreferredencoding()` to get encoding name.

`bytes.decode()` assumes `encoding='utf-8'` by default. It is incorrect on my
Windows setup, and causes `UnicodeDecodeError`.

2. use `errors='replace'`.

`bytes.decode()` assumes `errors='strict'` by default. Meson shouldn't crash
if subprocess outputs some garbage that can't be decoded.

`surrogateescape` doesn't work as expected on Windows. On Linux, default
`errors` for `sys.stdout` is `strict`, so `surrogateescape` can't be used there
too (at least until `sys.stdout` is reconfigured).

Fixes https://github.com/mesonbuild/meson/issues/8480

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