b4 sendemail.sendmailCmd support

Hi Konstantin et al.,

git-send-email(1) supports sendmailCmd' as a shell command-focused alternative to smtpServer{,Option}' [since Git 2.33]. Could b4 as well?
<https://git-send-email.io/#step-2> is a widely referenced tutorial that suggests the use of the newer option.

I briefly looked into writing a patch for this myself before chickening out at the number of conditionals already present in get_smtp and cmd_send 😅.

Thanks!

—Liam

[since Git 2.33] <https:/git.kernel.org/pub/scm/git/cgit/git.git/tree/Documentation/RelNotes/2.33.0.txt?h=ae3196a5ea84a9e88991d576020cf66512487088#n9>

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-K

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