pciutils, ntfs3g: don't pull in kmod on darwin

`kmod` is a linux-only package. Previous versions worked on `darwin`
by chance and might break in the future. Remove `kmod` import from
there.

Co-authored-by: Artturi <Artturin@artturin.com>

pkgs/tools/filesystems/ntfs-3g/default.nix

@@ -40,6 +40,7 @@ stdenv.mkDerivation rec {
     "--enable-extras"
     "--with-mount-helper=${mount}/bin/mount"
     "--with-umount-helper=${mount}/bin/umount"
+  ] ++ lib.optionals stdenv.isLinux [
     "--with-modprobe-helper=${kmod}/bin/modprobe"
   ];
 

pkgs/tools/system/pciutils/default.nix

@@ -14,10 +14,11 @@ stdenv.mkDerivation rec {
   };
 
   nativeBuildInputs = [ pkg-config ];
-  buildInputs = [ zlib kmod which ] ++
-    lib.optional stdenv.hostPlatform.isDarwin IOKit;
+  buildInputs = [ which zlib ]
+    ++ lib.optionals stdenv.hostPlatform.isDarwin [ IOKit ]
+    ++ lib.optionals stdenv.hostPlatform.isLinux [ kmod ];
 
-  preConfigure = if stdenv.cc.isGNU then null else ''
+  preConfigure = lib.optionalString (!stdenv.cc.isGNU) ''
     substituteInPlace Makefile --replace 'CC=$(CROSS_COMPILE)gcc' ""
   '';