duperemove: get linuxHeaders from stdenv

Building against anything other than the headers used to build libc
doesn't really make any sense.

Also: this package is Linux specific, so mark it as such.

pkgs/tools/filesystems/duperemove/default.nix

···
-{ lib, stdenv, fetchFromGitHub, libgcrypt
-, pkgconfig, glib, linuxHeaders, sqlite }:
+{ stdenv, fetchFromGitHub, libgcrypt
+, pkgconfig, glib, linuxHeaders ? stdenv.cc.libc.linuxHeaders, sqlite }:
 
 stdenv.mkDerivation rec {
   name = "duperemove-${version}";
···
 
   makeFlags = [ "DESTDIR=$(out)" "PREFIX=" ];
 
-  meta = {
+  meta = with stdenv.lib; {
     description = "A simple tool for finding duplicated extents and submitting them for deduplication";
     homepage = https://github.com/markfasheh/duperemove;
-    license = lib.licenses.gpl2;
-    maintainers = with lib.maintainers; [ bluescreen303 thoughtpolice ];
-    platforms = lib.platforms.all;
+    license = licenses.gpl2;
+    maintainers = with maintainers; [ bluescreen303 thoughtpolice ];
+    platforms = platforms.linux;
   };
 }

pkgs/top-level/all-packages.nix

···
 
   dtrx = callPackage ../tools/compression/dtrx { };
 
-  duperemove = callPackage ../tools/filesystems/duperemove {
-    linuxHeaders = linuxHeaders_3_18;
-  };
+  duperemove = callPackage ../tools/filesystems/duperemove { };
 
   dynamic-colors = callPackage ../tools/misc/dynamic-colors { };