treewide: cmake buildInputs to nativeBuildInputs, minor cleanups

pkgs/os-specific/linux/anbox/default.nix

@@ -1,5 +1,5 @@
 { stdenv, fetchFromGitHub, fetchurl
-, cmake, pkgconfig, dbus, makeWrapper
+, cmake, pkg-config, dbus, makeWrapper
 , gtest
 , boost
 , libcap
@@ -55,11 +55,13 @@ stdenv.mkDerivation rec {
   };
 
   nativeBuildInputs = [
+    cmake
+    pkg-config
     makeWrapper
   ];
 
   buildInputs = [
-    cmake pkgconfig dbus boost libcap gtest systemd mesa glib
+    dbus boost libcap gtest systemd mesa glib
     SDL2 SDL2_image protobuf protobufc properties-cpp lxc python
     libGL
   ];

pkgs/os-specific/linux/libwebcam/default.nix

@@ -2,7 +2,7 @@
 , stdenv
 , fetchurl
 , cmake
-, pkgconfig
+, pkg-config
 , libxml2
 }:
 
@@ -19,11 +19,8 @@ stdenv.mkDerivation rec {
     ./uvcdynctrl_symlink_support_and_take_data_dir_from_env.patch
   ];
 
-  buildInputs = [
-    cmake
-    pkgconfig
-    libxml2
-  ];
+  nativeBuildInputs = [ cmake pkg-config ];
+  buildInputs = [ libxml2 ];
 
   postPatch = ''
     substituteInPlace ./uvcdynctrl/CMakeLists.txt \