guix: Remove guix store paths from glibc

Without ffile-prefix-map, the debug symbols will contain paths for the
guix store which will include the hashes of each package. However, the
hash for the same package will differ when on different architectures.
In order to be reproducible regardless of the architecture used to build
the package, map all guix store prefixes to something fixed, e.g. /usr.

We might be able to drop this in favour of using --with-nonshared-cflags
when we being using newer versions of glibc.

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