linuxManualConfig: allow broken symlinks

pkgs/os-specific/linux/kernel/manual-config.nix

@@ -325,6 +325,10 @@ let
           else "install"))
       ];
 
+      # We remove a bunch of stuff that is symlinked from other places to save space,
+      # which trips the broken symlink check. So, just skip it. We'll know if it explodes.
+      dontCheckForBrokenSymlinks = true;
+
       postInstall = optionalString isModular ''
         mkdir -p $dev
         cp vmlinux $dev/