feat(3p/nix): meson: Don't look for libraries in lib dir r/731

1. First of all, this doesn't work in nixpkgs. Per [1], gcc ignores `-L`
   for purposes of `--print-file-dirs`, which breaks horribly on linux. But
   if we don't pass extra dirs, meosn first just tries `-l...`, which does
   work.

2. Even if it did work, `libdir` means where we are installing libs, not
   where libs are expected to be found. Those are not necessarily the
   same (again, nixpkgs), and even when they are and non-standard, it is
   better to use DESTDIR or have a modified toolchain.

[1]: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87758

(cherry picked from commit a142164e746644e20f66908c156ca913bef4664f)

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