loader.efi: Make rsdp global

[imp]

Summary

Make rsdp pointer to the RSDP global so we can look up other tables.

Sponsored by: Netflix

stand/efi/loader/main.c

 # Created by: [e-mail]
 # $FreeBSD$
 
 PORTNAME=       wayland
 PORTVERSION=    1.18.0
-PORTREVISION=   2
+PORTREVISION=   3
 CATEGORIES=     graphics wayland
 MASTER_SITES=   https://wayland.freedesktop.org/releases/
 
 PATCH_SITES=        https://gitlab.freedesktop.org/${PORTNAME}/${PORTNAME}/commit/
 PATCHFILES+=    0fc00fff3015.patch:-p1 # https://gitlab.freedesktop.org/wayland/wayland/merge_requests/60
 PATCHFILES+=    1283d54dac97.patch:-p1 # https://gitlab.freedesktop.org/wayland/wayland/merge_requests/61
 PATCHFILES+=    3a3dd0820de3.patch:-p1 # https://gitlab.freedesktop.org/wayland/wayland/merge_requests/61
 PATCHFILES+=    230885ebb40b.patch:-p1 # https://gitlab.freedesktop.org/wayland/wayland/merge_requests/61