[Bug 268402] mail(1) save command doesn't adhere to POSIX fallback to mbox

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=268402

            Bug ID: 268402
           Summary: mail(1) save command doesn't adhere to POSIX fallback
                    to mbox
           Product: Base System
           Version: Unspecified
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: standards
          Assignee: standards@FreeBSD.org
          Reporter: freebsd@tim.thechases.com

According to the POSIX definitions for mail(1),
the (s)ave command should save to "mbox" if the
file is not specified

> Save the specified messages in the file named
> by the pathname file, or the mbox if the file
> argument is omitted

https://pubs.opengroup.org/onlinepubs/9699919799/utilities/mailx.html#tag_20_75_13_33


> s[file]
>    Save the message in the named file
>   (mbox is default).

https://pubs.opengroup.org/onlinepubs/7908799/xcu/mail.html#tag_001_014_1339

However, when exercising this functionality,
mail(1) on FreeBSD (also tested on OpenBSD where
the same issue manifests) doesn't support this:

  demo$ echo test | mail -s test $USER
  demo$ mail
  Mail version 8.1 6/6/93.  Type ? for help.
  "/var/mail/demo": 1 message 1 new
  >N  1 demo@localhost.my.do  Thu Dec 15 19:34  19/775   "test"
  & s
  No file specified.

While I'm not positive on the solution,
I think it involves tweaking the save1() function
in src/usr.bin/mail/cmd2.c such that instead of
failing if it can't snarf(), it should set `file`
to "mbox" or "&" so that expand() points to the
mbox as required by POSIX.

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