scripts/test/lld.py adds --enable-memory64 --bigint when '64' appears
anywhere in the input path. The full Nix build directory is included,
and its nonce digits can contain '64' — non-deterministically triggering
the memory64 flags on unrelated tests (e.g. lld/duplicate_imports.wat)
and causing output mismatches. Match on basename instead.

This is myself.  I'm unfortunately not able to contribute to this maintenance anymore.

Fixes CVE-2025-14956 and CVE-2025-14957.

https://github.com/WebAssembly/binaryen/blob/version_126/CHANGELOG.md

This commit was created by a combination of scripts and tools:
- an ast-grep script to prefix things in meta with `lib.`,
- a modified nixf-diagnose / nixf combination to remove unused `with
lib;`, and
- regular nixfmt.

Co-authored-by: Wolfgang Walther <walther@technowledgy.de>