[php] Ensure _runme.php calls check::done()

This function doesn't do anything currently so these missing calls are a
latent issue.  It could be used for e.g. memory leak checking in the
future though, and it's potentially a useful place to add code when
debugging.

Examples/test-suite/php/member_pointer_const_runme.php

@@ -57,3 +57,5 @@ check::equal(3, member_pointer_const::call1(member_pointer_const::ADD_BY_VALUE,
 check::equal(7, member_pointer_const::call2(member_pointer_const::ADD_BY_VALUE, 3, 4), "Add by pointer");
 check::equal(11, member_pointer_const::call3(member_pointer_const::ADD_BY_VALUE, 5, 6), "Add by reference");
  */
+
+check::done();