Fix #80215: imap_mail_compose() may modify by-val parameters

We separate the input arrays and all sub-arrays to avoid modification
of the passed parameters.

This should be rewri

Fix #80215: imap_mail_compose() may modify by-val parameters

We separate the input arrays and all sub-arrays to avoid modification
of the passed parameters.

This should be rewritten to use `zend_string`s for the "master" branch.

Closes GH-6316.

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