lockdep: refactor into non-kernel package

Lockdep doesn't *really* require the kernel package - just the kernel
sources. It's really a user-space tool just compiled from some portable
code within the kernel, nothing more.

Signed-off-by: Austin Seipp <aseipp@pobox.com>

pkgs/os-specific/linux/kernel/lockdep.nix

@@ -1,25 +0,0 @@
-{ stdenv, kernel }:
-
-assert stdenv.lib.versionAtLeast kernel.version "3.14";
-stdenv.mkDerivation {
-  name = "lockdep-linux-${kernel.version}";
-  inherit (kernel) src patches;
-
-  preConfigure = "cd tools/lib/lockdep";
-  installPhase = ''
-    mkdir -p $out/bin $out/lib $out/include
-
-    cp -R include/liblockdep $out/include
-    make install DESTDIR=$out prefix=""
-
-    substituteInPlace $out/bin/lockdep --replace "./liblockdep.so" "$out/lib/liblockdep.so"
-  '';
-
-  meta = {
-    description = "User-space locking validation via the kernel";
-    homepage    = "https://kernel.org/";
-    license     = stdenv.lib.licenses.gpl2;
-    platforms   = stdenv.lib.platforms.linux;
-    maintainers = [ stdenv.lib.maintainers.thoughtpolice ];
-  };
-}