x11-wm/hyprland: skip updating headers after 47721ef8e32b

• Avoid ABI mismatch between bundled and system wlroots
• Building Hyprland on FreeBSD outside of ports/ may fail

Disables https://github.com/hyprwm/Hyprland/commit/3656045ad887

(cherry picked from commit 3a8517f68535b7c4f67f93c07dfeaa4eeaf41610)