Remove releaseWrapper as Signal tp_dealloc

It was being called when the Signal was garbage
collected, resulting in a segfault.

Reviewer: Luciano Wolf <luciano.wolf@openbossa.org>
Reviewer: Renato Filho <renato.filho@openbossa.org>

libpyside/qsignal.cpp

@@ -83,7 +83,7 @@ PyTypeObject PySideSignalType = {
     /*tp_name*/             "PySide.QtCore."SIGNAL_CLASS_NAME,
     /*tp_basicsize*/        sizeof(SignalData),
     /*tp_itemsize*/         0,
-    /*tp_dealloc*/          &Shiboken::deallocWrapper,
+    /*tp_dealloc*/          0,
     /*tp_print*/            0,
     /*tp_getattr*/          0,
     /*tp_setattr*/          0,