Use absolute paths in OPCache tests when calling opcache_compile_file()

This make sure the tests do not fail if they are not run from the
repository root.

Closes GH-10266

Signed-off-by: George Peter Banyard <[email protected]>

Author: LeSuisse

ext/opcache/tests/gh9968-1.inc

@@ -1,3 +1,3 @@
 <?php
 
-opcache_compile_file('ext/opcache/tests/gh9968-2.inc');
+opcache_compile_file(__DIR__ . '/gh9968-2.inc');

ext/opcache/tests/preload_const_autoload.inc

@@ -4,4 +4,4 @@ spl_autoload_register(function($class) {
     var_dump($class);
     new Abc;
 });
-opcache_compile_file('preload_const_autoload_2.inc');
+opcache_compile_file(__DIR__ . '/preload_const_autoload_2.inc');