[php-src] Issue #8718: 2 tests failing on s390x

Issue: https://github.com/php/php-src/issues/8718 Author: andypost ### Description Running tests on s390x fails following tests for preload ``` FAILED TEST SUMMARY --------------------------------------------------------------------- Handling of errors during linking [ext/opcache/tests/preload_006.phpt] Argument/return types must be available for preloading [ext/opcache/tests/preload_011.phpt] ``` Diff for preload_006.phpt: ``` TEST 8370/15548 [ext/opcache/tests/preload_006.phpt] │ ========DIFF======== │ 001+ Termsig=0 │ 001- Warning: Can't preload unlinked class B: Declaration of B::foo($bar) must be compatible with A::foo() in %spreload_inheritance_error.inc on line 8 │ 002- Foobar │ ========DONE======== │ FAIL Handling of errors during linking [ext/opcache/tests/preload_006.phpt] ``` Diff for preload_011.phpt: ``` TEST 8375/15548 [ext/opcache/tests/preload_011.phpt] │ ========DIFF======== │ 001+ Termsig=0 │ 001- Warning: Can't preload unlinked class H: Could not check compatibility between H::method($a): L and G::method($a): K, because class L is not available i│ ========DONE======== │ FAIL Argument/return types must be available for preloading [ext/opcache/tests/preload_011.phpt] ``` The latest run could be found at https://gitlab.alpinelinux.org/alpine/aports/-/jobs/738481 ### PHP Version since 7.4 and master too ### Operating System Alpinelinux