perlPackages.X11Protocol: drop unused pkgs.xlibsWrapper build input

`perlPackages.X11Protocol` seems to define serialization format over the
UNIX (or TCP) socket. It does not rely on on any X11 libraries and does
not install ELF executables.

Tested the change with diffoscope: the change is a no-on for both
"out" and "devdoc" outputs.

pkgs/top-level/perl-packages.nix

@@ -26970,8 +26970,6 @@ let
       url = "mirror://cpan/authors/id/S/SM/SMCCAM/X11-Protocol-0.56.tar.gz";
       hash = "sha256-3pbdbHwfJfMoeqevZJAr+ErKqo4MO7dqoWdjZ+BKCLc=";
     };
-    buildInputs = [ pkgs.xlibsWrapper ];
-    NIX_CFLAGS_LINK = "-lX11";
     doCheck = false; # requires an X server
     meta = {
       description = "Perl module for the X Window System Protocol, version 11";