Convert bsdinstall/distextract for libbsddialog

[asiciliano]

Summary

Convert bsdinstall/distextract for libbsddialog.

This review depends on libbsddialog 0.0.2 https://reviews.freebsd.org/D33580

Test Plan

Download some txz from distfetch https://reviews.freebsd.org/D33425
then:

env DISTRIBUTIONS="kernel.txz tests.txz" BSDINSTALL_CHROOT="./extractdir" BSDINSTALL_DISTDIR="/home/test" ./distextract
`

┌────────Archive Extraction────────┐                      
│ kernel.txz       [    Done     ] │                      
│ tests.txz        [    Done     ] │                      
│                                  │                      
│ Extracting distribution files... │                      
│                                  │                      
│  ┌─Overall Progress───────────┐  │                      
│  │            100%            │  │                      
│  └────────────────────────────┘  │                      
└──────────────────────────────────┘

`
ls extractdir/boot/kernel/
... kmods and company ...

[bapt]

usr.sbin/bsdinstall/distextract/Makefile

5–6

HAVE_BSDDIALOG is not necessary here, why adding it?

[asiciliano]

usr.sbin/bsdinstall/distextract/Makefile

5–6

Ops sorry, of course it is an error (I opened the tzseup Makefile instead of the distfetch Makefile).
Should I update the review or can you fix before to commit?

[asiciliano]

Update review to fix Makefile:

• delete -DHAVE_BSDDIALOG

[asiciliano]

Address Revision Feedback: fix Makefile

usr.sbin/bsdinstall/distextract/Makefile

5–6

Makefile fixed

[bapt]

pushed with modification for it to build properly in base (warning about const char * vs char *