treewide: cmake buildInputs to nativeBuildInputs, minor cleanups

pkgs/development/libraries/libsnark/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, cmake, pkgconfig, openssl, boost, gmp, procps }:
+{ stdenv, fetchFromGitHub, cmake, pkg-config, openssl, boost, gmp, procps }:
 
 let
   rev = "9e6b19ff15bc19fba5da1707ba18e7f160e5ed07";
@@ -7,7 +7,8 @@ in stdenv.mkDerivation rec {
   name = "libsnark-pre${version}";
   version = stdenv.lib.substring 0 8 rev;
 
-  buildInputs = [ cmake pkgconfig openssl boost gmp ] ++ lib.optional stdenv.hostPlatform.isLinux procps;
+  nativeBuildInputs = [ cmake pkg-config ];
+  buildInputs = [ openssl boost gmp ] ++ lib.optional stdenv.hostPlatform.isLinux procps;
 
   cmakeFlags = lib.optionals stdenv.hostPlatform.isDarwin [ "-DWITH_PROCPS=OFF" "-DWITH_SUPERCOP=OFF" ];
 
@@ -19,8 +20,6 @@ in stdenv.mkDerivation rec {
     fetchSubmodules = true;
   };
 
-  enableParallelBuilding = true;
-
   meta = with stdenv.lib; {
     description = "C++ library for zkSNARKs";
     homepage = "https://github.com/scipr-lab/libsnark";