[Gnu-efi-discuss] Add the .sbat section to the section map

[Richard H. <hug...@gm...>]

This has been part of fwupd-efi for a long time now.

Also; I can't pretend to understand all this, so please review this
carefully and let me know what you think. For those following along,
I'm trying to unfork the fedora gnu-efi version of gnu-efi (99% done),
and also unfork the lds and .S parts of fwupd-efi that we use as a
fallback.

Richard.