perlPackages.X11XCB: fix strictDeps

pkgs/top-level/perl-packages.nix

@@ -24547,6 +24547,7 @@ let
       })
     ];
     AUTOMATED_TESTING = false;
+    nativeBuildInputs = [ pkgs.pkg-config ];
     buildInputs = [ pkgs.xorg.libxcb pkgs.xorg.xcbproto pkgs.xorg.xcbutil pkgs.xorg.xcbutilwm ExtUtilsDepends ExtUtilsPkgConfig TestDeep TestException XSObjectMagic ];
     propagatedBuildInputs = [ DataDump MouseXNativeTraits XMLDescent XMLSimple ];
     NIX_CFLAGS_LINK = "-lxcb -lxcb-util -lxcb-xinerama -lxcb-icccm";