tree-wide: patchelf used during build -> nativeBuildInputs

In a few cases it wasn't clear so I left them as-is.

While visiting these moved other things to nativeBuildInputs
when it was clear they were one of these cases:

* makeWrapper
* archive utilities (in order to unpack src)
  * a few of these might no longer be needed but leaving for another day

pkgs/development/compilers/gcc-arm-embedded/default.nix

@@ -21,7 +21,7 @@ stdenv.mkDerivation {
     sha256 = sha256;
   };
 
-  buildInputs = [ bzip2 patchelf ];
+  nativeBuildInputs = [ bzip2 patchelf ];
 
   dontPatchELF = true;
 

pkgs/development/compilers/mentor/default.nix

@@ -10,7 +10,7 @@ let
     stdenv.mkDerivation rec {
       inherit name src;
 
-      buildInputs = [ patchelf ];
+      nativeBuildInputs = [ patchelf ];
 
       buildCommand = ''
         # Unpack tarball

pkgs/development/compilers/mlton/default.nix

@@ -38,7 +38,8 @@ stdenv.mkDerivation rec {
 
   sourceRoot = name;
 
-  buildInputs = [ gmp ] ++ stdenv.lib.optional stdenv.isLinux patchelf;
+  buildInputs = [ gmp ];
+  nativeBuildInputs = stdenv.lib.optional stdenv.isLinux patchelf;
 
   makeFlags = [ "all-no-docs" ];
 

pkgs/development/compilers/opendylan/bin.nix

@@ -15,7 +15,7 @@ stdenv.mkDerivation {
     }
     else throw "platform ${stdenv.hostPlatform.system} not supported.";
 
-  buildInputs = [ patchelf boehmgc gnused makeWrapper ];
+  nativeBuildInputs = [ patchelf boehmgc gnused makeWrapper ];
 
   buildCommand = ''
     mkdir -p "$out"