treewide: remove empty buildInputs

pkgs/applications/science/logic/potassco/clingo.nix

@@ -9,8 +9,7 @@ stdenv.mkDerivation rec {
     sha256 = "01czx26p8gv81ahrh650x208hjhd8bx1kb688fmk1m4pw4yg5bfv";
   };
 
-  buildInputs = [];
-  nativeBuildInputs = [cmake];
+  nativeBuildInputs = [ cmake ];
 
   cmakeFlags = [ "-DCLINGO_BUILD_WITH_PYTHON=OFF" ];
 

pkgs/applications/science/math/nauty/default.nix

@@ -19,7 +19,6 @@ stdenv.mkDerivation rec {
     sandybridge    = [ "--disable-clz" ];
     ivybridge      = [ "--disable-clz" ];
   }.${stdenv.hostPlatform.platform.gcc.arch or "default"} or [];
-  buildInputs = [];
   installPhase = ''
     mkdir -p "$out"/{bin,share/doc/nauty} "$dev"/{lib,include/nauty}
 

pkgs/development/libraries/safefile/default.nix

@@ -8,8 +8,6 @@ stdenv.mkDerivation rec {
     sha256 = "1y0gikds2nr8jk8smhrl617njk23ymmpxyjb2j1xbj0k82xspv78";
   };
 
-  buildInputs = [];
-
   passthru = {
     updateScript = ''
       #!${runtimeShell}

pkgs/development/libraries/spandsp/default.nix

@@ -6,7 +6,6 @@ stdenv.mkDerivation rec {
     url = "https://www.soft-switch.org/downloads/spandsp/spandsp-${version}.tar.gz";
     sha256 = "0rclrkyspzk575v8fslzjpgp4y2s4x7xk3r55ycvpi4agv33l1fc";
   };
-  buildInputs = [];
   propagatedBuildInputs = [audiofile libtiff];
   meta = {
     homepage = http://www.creytiv.com/baresip.html;
@@ -18,4 +17,3 @@ stdenv.mkDerivation rec {
     updateWalker = true;
   };
 }
-

pkgs/development/python-modules/graph_nets/default.nix

@@ -20,8 +20,6 @@ buildPythonPackage rec {
     sha256 = "6f27f0358a477d4ec3ab300bf09944b4dfdd5c10b0a5f7ac06bcb32d1327ebe1";
   };
 
-  buildInputs = [];
-
   postPatch = ''
     # https://github.com/deepmind/graph_nets/issues/63
     sed -i 's/dm-sonnet==1.23/dm-sonnet/' setup.py

pkgs/development/python-modules/pulp/default.nix

@@ -9,7 +9,6 @@ buildPythonPackage rec {
     sha256 = "1irzpfnnm5f0qf8y9ddxi489nwixyj0q4zlvqafm621bijkxdv6g";
   };
 
-  buildInputs = [];
   propagatedBuildInputs = [ pyparsing ];
 
   # only one test that requires an extra

pkgs/tools/misc/clac/default.nix

@@ -1,4 +1,4 @@
-{stdenv, fetchFromGitHub}:
+{ stdenv, fetchFromGitHub }:
 stdenv.mkDerivation rec {
   pname = "clac";
   version = "0.0.0.20170503";
@@ -10,8 +10,7 @@ stdenv.mkDerivation rec {
     sha256 = "0j8p1npgq32s377c9lw959h5i2csq4yb27cvg7av17bji46816bv";
   };
 
-  buildInputs = [];
-  makeFlags = ["PREFIX=$(out)"];
+  makeFlags = [ "PREFIX=$(out)" ];
 
   postInstall = ''
     mkdir -p "$out/share/doc/${pname}"