MFH: r489721

lang/php73: Fix "Bus error (core dumped)" by disabling ifuncs

PHP 7.3 uses ifuncs optimisations which generates a list of problems on FreeBSD:
https://bugs.php.net/bug.php?id=77284
https://bugs.php.net/bug.php?id=77279
https://bugs.php.net/bug.php?id=77261

Therefore ifuncs will be disabled in PHP 7.3.1. To make it usable until the release,
we import the patch until then:
https://github.com/php/php-src/commit/291589114aa9be899cf7d5d874c3b5bbdb35f336

PR: 233024
Submitted by: Pascal Christen <pascal.christen@hostpoint.ch>

Approved by: ports-secteam (miwi)