Log Message:
xentools46: fixes to build on netbsd-current,

- fix with gcc6 (unused function, misleading indentation), from upstream
- Makefile fix for newer iasl, from upstream
- seabios table fix from me/debian/etc submitted here:
https://mail.coreboot.org/pipermail/seabios/2018-June/012348.html

bump pkgrevision for paranoia.