Revert "pciutils: use standardized equivalent for canonicalize_file_name"

This reverts commit f8db20fb3a.
Patching should no longer be needed with 3.6.1.

pkgs/tools/system/pciutils/default.nix

@@ -22,16 +22,6 @@ stdenv.mkDerivation rec {
 
   installTargets = "install install-lib";
 
-  # Use standardized and equivalent realpath(path, NULL) instead of canonicalize_file_name(path).
-  # This is documented to be equivalent, see `man 3 canonicalize_file_name`.
-  # Fixes w/musl.
-  # Upstream PR: https://github.com/pciutils/pciutils/pull/6
-  postPatch = ''
-    substituteInPlace lib/sysfs.c \
-      --replace "canonicalize_file_name(path)" \
-                "realpath(path, NULL)"
-  '';
-
   # Get rid of update-pciids as it won't work.
   postInstall = "rm $out/sbin/update-pciids $out/man/man8/update-pciids.8";