ttys: Enable video ttys only if the device exists

Credit: https://reviews.freebsd.org/D15169

nrelease: Add 'IMGSIZE_MB' to specify file size in units of MB

The image file size was specified by the 'IMGSIZE' variable, but it's
the number of 512-byte sectors, which isn't intuitive and require

nrelease: Add 'IMGSIZE_MB' to specify file size in units of MB

The image file size was specified by the 'IMGSIZE' variable, but it's
the number of 512-byte sectors, which isn't intuitive and requires a
manual conversion. Add the 'IMGSIZE_MB' variable to directly specify
the file size in units of MB, which is more intuitive and friendly.

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nrelease: Remove downloaded packages from ISO/IMG

nrelease: Allow /etc/ssl/cert.pem be missing

The 'pkg-bootstrap' target in '/usr/Makefile' has been updated to work
without '/etc/ssl/cert.pem', so ignore copy failure of this file.

nrelease: Improve 'etc.hdd' creation to eliminate inconsistency

Previously, the 'etc.hdd' was created during the 'buildiso' target and
then updated in the 'pkgs' target. However, in the 'pkgs' targ

nrelease: Improve 'etc.hdd' creation to eliminate inconsistency

Previously, the 'etc.hdd' was created during the 'buildiso' target and
then updated in the 'pkgs' target. However, in the 'pkgs' target, only
the password files (i.e., master.passwd, passwd, group) were copied but
the password DBs (i.e., pwd.db, spwd.db) were not rebuild. This caused
an inconsistency in 'etc.hdd'. When a user tried manual installation
and forgot to run 'pwd_mkdb', the installed system would fail to add new
users and generate errors like:

> pw: user 'myuser' disappeared during update.
> adduser: ERROR: There was an error adding user (myuser).

This commit improves the creation of 'etc.hdd'. Reorder the 'customiso'
target *after* the 'pkgs' target, so we can simply copy the 'etc' to
'etc.hdd' and be done, without any further changes, and the resulting
password files and DBs are in consistency. In addition, this avoids
adding the 'installer' user to the 'etc.hdd' and so we get a cleaner
system by default.

See also: https://lists.dragonflybsd.org/pipermail/users/2023-February/428576.html
(Regenerating the password databases on new installs)

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nrelease - Copy `/etc/ssl/cert.pem` into ISOROOT

Otherwise it fails when using target `binpkg`:

```
9984868:error:14FFF086:SSL routines:(UNKNOWN)SSL_internal:certificate verify failed:/usr/src/lib/

nrelease - Copy `/etc/ssl/cert.pem` into ISOROOT

Otherwise it fails when using target `binpkg`:

```
9984868:error:14FFF086:SSL routines:(UNKNOWN)SSL_internal:certificate verify failed:/usr/src/lib/libressl/../../crypto/libressl/ssl/tls13_client.c:617:
pkg-static: https://mirror-master.dragonflybsd.org/dports/dragonfly:6.4:x86:64/LATEST/packagesite.txz: Authentication error
Unable to update repository Avalon
Error updating repositories!
```

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Fix some 'any more' vs. 'anymore' confusion in manpages and messages.

nrelease: Switch to makefs(8) for the ISO's EFI system partition image.

Tested-by: tuxillo

nrelease: Add a $WORLD_VERSION variable.

Can be useful when using new features in the release build.

nrelease: DPorts not needed for binpkgs/nopkgs