[php-src] Issue #13215: GCC 14 build issue (c_atomic)

Issue: https://github.com/php/php-src/issues/13215 Author: remicollet ### Description Noticed during Fedora 40 mass rebuild using GCC 14 ``` In file included from /builddir/build/BUILD/php-8.3.2/Zend/zend_globals.h:30, from /builddir/build/BUILD/php-8.3.2/Zend/zend_compile.h:769, from /builddir/build/BUILD/php-8.3.2/Zend/zend_modules.h:24, from /builddir/build/BUILD/php-8.3.2/Zend/zend_API.h:25, from /builddir/build/BUILD/php-8.3.2/main/php.h:35, from /builddir/build/BUILD/php-8.3.2/ext/bcmath/bcmath.c:21: /builddir/build/BUILD/php-8.3.2/Zend/zend_atomic.h: In function 'zend_atomic_bool_exchange_ex': /builddir/build/BUILD/php-8.3.2/Zend/zend_atomic.h:88:16: error: implicit declaration of function '__c11_atomic_exchange'; did you mean '__atomic_exchange'? [-Wimplicit-function-declaration] 88 | return __c11_atomic_exchange(&obj->value, desired, __ATOMIC_SEQ_CST); | ^~~~~~~~~~~~~~~~~~~~~ | __atomic_exchange /builddir/build/BUILD/php-8.3.2/Zend/zend_atomic.h: In function 'zend_atomic_bool_load_ex': /builddir/build/BUILD/php-8.3.2/Zend/zend_atomic.h:92:16: error: implicit declaration of function '__c11_atomic_load'; did you mean '__atomic_load'? [-Wimplicit-function-declaration] 92 | return __c11_atomic_load(&obj->value, __ATOMIC_SEQ_CST); | ^~~~~~~~~~~~~~~~~ | __atomic_load /builddir/build/BUILD/php-8.3.2/Zend/zend_atomic.h: In function 'zend_atomic_bool_store_ex': /builddir/build/BUILD/php-8.3.2/Zend/zend_atomic.h:96:9: error: implicit declaration of function '__c11_atomic_store'; did you mean '__atomic_store'? [-Wimplicit-function-declaration] 96 | __c11_atomic_store(&obj->value, desired, __ATOMIC_SEQ_CST); | ^~~~~~~~~~~~~~~~~~ | __atomic_store ``` Full build log https://kojipkgs.fedoraproject.org//work/tasks/8789/112128789/build.log Also breaks packages using PHP, ex: SWIG See https://github.com/swig/swig/issues/2765 ### PHP Version N/A ### Operating System _No response_