guix: disable LTO in GCC #35261

We don't use LTO in release builds, and neither do any of our dependencies, so disable support in GCC. This saves some compilation when building the toolchain. It would also make it clear if something started using it.

Also disable Native Language Support as this is also not needed:

The --enable-nls option enables Native Language Support (NLS), which lets GCC output diagnostics in languages other than American English. Native Language Support is enabled by default if not doing a canadian cross build.

See https://gcc.gnu.org/install/configure.html.

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Code Coverage & Benchmarks

For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/35261.

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Conflicts

Reviewers, this pull request conflicts with the following ones:

• #25573 (guix: produce a -static-pie bitcoind by fanquake)

If you consider this pull request important, please also help to review the conflicting pull requests. Ideally, start with the one that should be merged first.

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