mc: stop retaining configure arguments in the final binary

Reduces closure size of cross-compiled binary a bit by not retaining
build-time perl and friends.

Before:

    $ nix path-info -Sh $(nix-build -A pkgsCross.ppc64.mc) | unnix
    /<<NIX>>/mc-powerpc64-unknown-linux-gnu-4.8.28   273.7M

After:

    $ nix path-info -Sh $(nix-build -A pkgsCross.ppc64.mc) | unnix
    /<<NIX>>/mc-powerpc64-unknown-linux-gnu-4.8.28   198.6M

pkgs/applications/file-managers/mc/default.nix

@@ -67,6 +67,10 @@ stdenv.mkDerivation rec {
     "PERL=${perl}/bin/perl"
     # used for .hlp generation at build time:
     "PERL_FOR_BUILD=${buildPackages.perl}/bin/perl"
+
+    # configure arguments have a bunch of build-only dependencies.
+    # Avoid their retention in final closure.
+    "--disable-configure-args"
   ];
 
   postPatch = ''
@@ -77,11 +81,6 @@ stdenv.mkDerivation rec {
       --replace /bin/cat ${coreutils}/bin/cat
   '';
 
-  preFixup = ''
-    # remove unwanted build-dependency references
-    sed -i -e "s!PKG_CONFIG_PATH=''${PKG_CONFIG_PATH}!PKG_CONFIG_PATH=$(echo "$PKG_CONFIG_PATH" | sed -e 's/./0/g')!" $out/bin/mc
-  '';
-
   postFixup = lib.optionalString (!stdenv.isDarwin) ''
     # libX11.so is loaded dynamically so autopatch doesn't detect it
     patchelf \