Add catches_strings test to test throws char * typemap

Examples/test-suite/php/catches_strings_runme.php

@@ -0,0 +1,14 @@
+<?php
+
+require "tests.php";
+
+$exception_thrown = false;
+try {
+  StringsThrower::charstring();
+} catch (Exception $e) {
+  check::str_contains($e->getMessage(), "charstring message", "incorrect exception message: {$e->getMessage()}");
+  $exception_thrown = true;
+}
+check::equal($exception_thrown, true, "Should have thrown an exception");
+
+check::done();