nixos/xen: dehardcode the .pad section from the UKI builder
Upstream, intentionally or not, no longer appends the EFI image
with a .pad section for us to hook the rest of the UKI to. This
simply dehardcodes .pad from the awk script, instead using the
very last section in the binary. (Currently .reloc)
Co-authored-by: Yaroslav Bolyukin <iam@lach.pw>
Signed-off-by: Fernando Rodrigues <alpha@sigmasquadron.net>
(cherry picked from commit 54dadb2a6236ecaa12d72dc8e0a5bdf96d919f84)