nixpkgs: add pkgconfig to icestorm nativeBuildInputs

This helps iceprog find libftdi appropriately on its own, without a
bunch of gross errors in the build process (which should not be a
problem, but may *look* like one!)

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

+2 -1
+2 -1
pkgs/development/tools/icestorm/default.nix
··· 1 - { stdenv, fetchFromGitHub, python3, libftdi }: 1 + { stdenv, fetchFromGitHub, python3, libftdi, pkgconfig }: 2 2 3 3 stdenv.mkDerivation rec { 4 4 name = "icestorm-${version}"; ··· 11 11 sha256 = "18qy7gylnydgzmqry1b4r0ilm6lkjdcyn0wj03syxdig9dbjiacm"; 12 12 }; 13 13 14 + nativeBuildInputs = [ pkgconfig ]; 14 15 buildInputs = [ python3 libftdi ]; 15 16 preBuild = '' 16 17 makeFlags="PREFIX=$out $makeFlags"