bsdconfig(8): add bsddialog(1)

[asiciliano]

Summary

Add bsddialog(1) to bsdconfig(8). This can be considered an increment not a replacement, `$DIALOG=dialog' restores dialog(1).

Test Plan

bsddialog 0.4 was released to match the features of bsdconfig.

To test, with a recent CURRENT:
$DIALOG=bsddialog changing /usr/share/bsdconfig/dialog.subr like the review.

otherwise

$ git clone https://gitlab.com/alfix/bsddialog.git
$ cd bsddialog
$ make

$DIALOG=/absolute/path/bsddialog changing /usr/share/bsdconfig/dialog.subr like the review.

Of course it is possible to apply the diff in src/.

[asiciliano]

ping @dteske

[jrtc27]

usr.sbin/bsdconfig/share/dialog.subr

82–90

Does this not break Xdialog?

2305

Wrong dialog?

[asiciliano]

usr.sbin/bsdconfig/share/dialog.subr

82–90

Ok. I think you refer to DIALOG_ESC for Xdialog. Otherwise, please let me know how I can reproduce the fault.

I'll fix it under, where -X is parsed/processed and USE_XDIALOG and $DIALOG=Xdialog are set.

2305

OK. I' ll fix.

[asiciliano]

Thank you for the review, the updated diff should fix.