mono: don't propagate a dependency to glib-dev
mono: don't propagate a dependency to glib-dev

This was added in 2005 back in r51ce4ea2. This was not commented or
explained anywhere, and it does not seem to be necessary anymore
according to some quick testing I did.

Reduces mono closure size by ~100M.

NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs