misc pkgs: Manual fixup pkgconfig nativeBuildInputs after sed

Importantly, this included regenerating pkgs/servers/x11/xorg, to
clobber the old sed.

pkgs/servers/x11/xorg/generate-expr-from-tarballs.pl

@@ -281,7 +281,7 @@ foreach my $pkg (sort (keys %pkgURLs)) {
       url = $pkgURLs{$pkg};
       sha256 = "$pkgHashes{$pkg}";
     };
-  nativeBuildInputs = [ pkgconfig ];
+    nativeBuildInputs = [ pkgconfig ];
     buildInputs = [ $inputs];$extraAttrs
     meta.platforms = stdenv.lib.platforms.unix;
   }) // {inherit $inputs;};