Motivation for this change

patchelf seems to generate an ELF that "strip" cannot process:

  strip: /tmp/stNGAZvd: not enough room for program headers, try linking with -N
  strip:/tmp/stNGAZvd[.interp]: bad value

(This unfortunately does not cause any errors or even error output in
the build log, since the default strip hook redirects them to /dev/null
and ignores failures.)

The lack of stripping ends up leaking paths to the compiler in the debug
symbols. This more than doubles the transitive closure size of
alacritty.

Impact on closure size: 314.5M -> 131.8M.

Note: I did not file a specific bug about this for patchelf, but there seem to be multiple similar bugs already open (e.g. NixOS/patchelf#196).

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.