Allow xinstall and makefs to be crossbuilt on Linux and Mac

[arichardson]

Summary

I need these tools in order to install the crossbuilt FreeBSD and create a
disk image. Linux does not have a st_flags in struct stat so unfortunately
I need a bunch of ugly ifdefs. The resulting binaries allow me to
sucessfully install a MIPS64 world and create a disk-image that boots.

[brooks]

LGTM, but I'd wait for @emaste to take a look as he's been working on makefs.

usr.bin/xinstall/xinstall.c

1003

I'd preserve the blank line.

usr.sbin/makefs/ffs.c

322

I'd GC this block in a separate commit. It's been "not yet" since 2008...

[imp]

Why not the less ugly #ifdef UF_SETTABLE?

you wouldn't need the nbtool junk either.

[arichardson]

In D13307#292355, @imp wrote:

Why not the less ugly #ifdef UF_SETTABLE?

you wouldn't need the nbtool junk either.

I didn't know there was a macro I could check that works across operating systems to check for st_flags availability. It seems like macOS has the UF_SETTABLE in sys/stat.h and Linux doesn't so I could remove the nbtool changes. I'll post a follow up patch tomorrow.

[imp]

In D13307#292366, @arichardson wrote:

In D13307#292355, @imp wrote:

Why not the less ugly #ifdef UF_SETTABLE?

you wouldn't need the nbtool junk either.

I didn't know there was a macro I could check that works across operating systems to check for st_flags availability. It seems like macOS has the UF_SETTABLE in sys/stat.h and Linux doesn't so I could remove the nbtool changes. I'll post a follow up patch tomorrow.

Excellent! Glad I could suggest something. I think there used to be ifdefs there like that back in the net2 / bsd4.4 days...

Also, --include nbtool_config.h could help as well on the !FreeBSD platforms.