Fix two bad type identifiers that caused crashes on OSX (icglue and Nav).

Silence two innocuous warnings (_File and _collections).

Mac/Modules/Nav.c

@@ -403,8 +403,7 @@ static char Navrrtype__doc__[] =
 ;
 
 static PyTypeObject Navrrtype = {
-	PyObject_HEAD_INIT(&PyType_Type)
-	0,				/*ob_size*/
+	PyVarObject_HEAD_INIT(&PyType_Type, 0)
 	"Nav.NavReplyRecord",			/*tp_name*/
 	sizeof(navrrobject),		/*tp_basicsize*/
 	0,				/*tp_itemsize*/

Mac/Modules/file/_Filemodule.c

@@ -3193,7 +3193,7 @@ PyMac_GetFSRef(PyObject *v, FSRef *fsr)
 
         /* On OSX we now try a pathname */
         if ( PyString_Check(v) || PyUnicode_Check(v)) {
-                char *path = NULL;
+                unsigned char *path = NULL;
                 if (!PyArg_Parse(v, "et", Py_FileSystemDefaultEncoding, &path))
                         return 0;
                 if ( (err=FSPathMakeRef(path, fsr, NULL)) )

Mac/Modules/icgluemodule.c

@@ -392,8 +392,7 @@ static char Icitype__doc__[] =
 ;
 
 static PyTypeObject Icitype = {
-	PyObject_HEAD_INIT(&PyType_Type)
-	0,				/*ob_size*/
+	PyVarObject_HEAD_INIT(&PyType_Type, 0)
 	"icglue.ic_instance",		/*tp_name*/
 	sizeof(iciobject),		/*tp_basicsize*/
 	0,				/*tp_itemsize*/

Modules/_collectionsmodule.c

@@ -1103,7 +1103,7 @@ defdict_copy(defdictobject *dd)
 	   whose class constructor has the same signature.  Subclasses that
 	   define a different constructor signature must override copy().
 	*/
-	return PyObject_CallFunctionObjArgs(Py_Type(dd),
+	return PyObject_CallFunctionObjArgs((PyObject *)Py_Type(dd),
 					    dd->default_factory, dd, NULL);
 }