[php-src] Issue #11629: ext/imap/tests/bug77020.phpt tries to send mail

Issue: https://github.com/php/php-src/issues/11629 Author: orlitzky ### Description I noticed today that this test actually tries to send mail: ``` $ cat ext/imap/tests/bug77020.phpt --TEST-- Bug #77020 (null pointer dereference in imap_mail) --EXTENSIONS-- imap --FILE-- <?php @imap_mail('1', 1, NULL); echo 'done' ?> --EXPECTF-- %Adone ``` In the docs, the imap_mail() function is a bit mysterious, but if you read ext/imap/php_imap.c, then basically, it runs sendmail: ```C if (!INI_STR("sendmail_path")) { return 0; } sendmail = popen(INI_STR("sendmail_path"), "w"); if (sendmail) { ... ``` I was a little surprised to see it try to relay through my mail server (which is what /usr/bin/sendmail is configured to do by default): ``` Jul 07 17:51:31 [postfix/cleanup] 43FF23635AF: message-id=<20230707215131.43FF23635AF@gantu> Jul 07 17:51:31 [postfix/qmgr] 43FF23635AF: from=<root@gantu.localdomain>, size=272, nrcpt=1 (queue active) Jul 07 17:51:31 [postfix/smtp] 43FF23635AF: to=<1@gantu.localdomain>, orig_to=<1> ... 554 5.7.1 <1@gantu.localdomain>: Recipient address rejected: Access denied (in reply to RCPT TO command)) ``` I can probably fix this in our distribution package by setting sendmail_path = /bin/true or something like that, but I think it's a big enough surprise to report. A similar solution might work in the test itself, but I don't know what we could use on Windows. ### PHP Version php-8.2.8 ### Operating System _No response_