Avoid dl() in bug77578.phpt (GH-16663)

Avoid dl() in bug77578.phpt

`dl()` has known issues regarding permanent strings[1], so we better
avoid it, even if that means that we need to spawn two sub-processes.

[1] <#9196>

Author: cmb69

ext/com_dotnet/tests/bug77578.phpt

@@ -6,18 +6,33 @@ com_dotnet
 <?php
 // To actually be able to verify the crash during shutdown on Windows, we have
 // to execute a PHP subprocess, and check its exit status.
+
+// First we determine whether com_dotnet would be loaded in the subprocess
 $php = getenv('TEST_PHP_EXECUTABLE_ESCAPED');
-$extension_dir = escapeshellarg(ini_get("extension_dir"));
 $script = <<<SCRIPT
-if (!extension_loaded('com_dotnet')) dl('com_dotnet');
+echo extension_loaded('com_dotnet') ? 'yes' : 'no';
+SCRIPT;
+exec("$php -r \"$script\"", $output);
+var_dump(isset($output[0]));
+$loaded = $output[0] === "yes";
+$output = null;
+
+// Then we run the subprocess with com_dotnet loaded
+$script = <<<SCRIPT
 ini_set('com.autoregister_typelib', '1');
 new COM('WbemScripting.SWbemLocator');
 SCRIPT;
-$command = "$php -d extension_dir=$extension_dir -r \"$script\"";
+if ($loaded) {
+    $command = "$php -r \"$script\"";
+} else {
+    $extension_dir = escapeshellarg(ini_get("extension_dir"));
+    $command = "$php -d extension_dir=$extension_dir -d extension=com_dotnet -r \"$script\"";
+}
 exec($command, $output, $status);
 var_dump($output, $status);
 ?>
 --EXPECT--
+bool(true)
 array(0) {
 }
 int(0)