pciutils: fixup finding modules to libkmod's way

Fixes #20683.

pkgs/tools/system/pciutils/default.nix

@@ -8,6 +8,8 @@ stdenv.mkDerivation rec {
     sha256 = "0byl2f897w5lhs4bvr6p7qwcz9bllj2zyfv7nywbcbsnb9ha9wrb";
   };
 
+  patches = [ ./module-dir.diff ];
+
   buildInputs = [ pkgconfig zlib kmod which ];
 
   makeFlags = "SHARED=yes PREFIX=\${out}";

pkgs/tools/system/pciutils/module-dir.diff

@@ -0,0 +1,23 @@
+Don't override libkmod's way of finding modules.
+
+(We override that behavior in nixpkgs to fit nixos.)
+
+diff --git a/ls-kernel.c b/ls-kernel.c
+index 78b70f1..ecacd0e 100644
+--- a/ls-kernel.c
++++ b/ls-kernel.c
+@@ -29,13 +29,7 @@ show_kernel_init(void)
+   if (show_kernel_inited >= 0)
+     return show_kernel_inited;
+ 
+-  struct utsname uts;
+-  if (uname(&uts) < 0)
+-    die("uname() failed: %m");
+-  char *name = alloca(64 + strlen(uts.release));
+-  sprintf(name, "/lib/modules/%s", uts.release);
+-
+-  kmod_ctx = kmod_new(name, NULL);
++  kmod_ctx = kmod_new(NULL, NULL);
+   if (!kmod_ctx)
+     {
+       fprintf(stderr, "lspci: Unable to initialize libkmod context\n");