Change PHP_ZTS and PHP_DEBUG to bool to match their ZEND equivalents #13079
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The constants ZEND_THREAD_SAFE and PHP_ZTS, and ZEND_DEBUG_BUILD and PHP_DEBUG are based on the same underlying values (the values of ZTS and ZEND_DEBUG respectively). Despite this, the ZEND constants are bool while their PHP equivalents are int. This PR aims to change these aliases to be of the same type, bool.
php-src included one test file that used a loose comparison with PHP_ZTS which this PR also updates to use the same format other comparisons with this constant use (i.e
if (PHP_ZTS)
/if (!PHP_ZTS)
).