treewide: cmake buildInputs to nativeBuildInputs, minor cleanups

pkgs/development/libraries/libebur128/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, cmake, speexdsp, pkgconfig }:
+{ stdenv, fetchFromGitHub, cmake, speexdsp, pkg-config }:
 
 stdenv.mkDerivation rec {
   version = "1.2.4";
@@ -11,8 +11,8 @@ stdenv.mkDerivation rec {
     sha256 = "0n81rnm8dm1zmibkr2v3q79rsd609y0dbbsrbay18njcjva88p0g";
   };
 
-  nativeBuildInputs = [ pkgconfig ];
-  buildInputs = [ cmake speexdsp ];
+  nativeBuildInputs = [ cmake pkg-config ];
+  buildInputs = [ speexdsp ];
 
   meta = with stdenv.lib; {
     description = "Implementation of the EBU R128 loudness standard";