Mod to previous checkin: we must require ascii, not system defautl encoding,

because we have no easy way to convert the python encoding string to
a CF encoding parameter.

Mac/Modules/cf/cfsupport.py

@@ -360,7 +360,7 @@ class CFStringRefObjectDefinition(MyGlobalObjectDefinition):
 		if (v == Py_None) { *p_itself = NULL; return 1; }
 		if (PyString_Check(v)) {
 		    char *cStr;
-		    if (!PyArg_Parse(v, "et", "ascii", &cStr))
+		    if (!PyArg_Parse(v, "es", "ascii", &cStr))
 		    	return NULL;
 			*p_itself = CFStringCreateWithCString((CFAllocatorRef)NULL, cStr, kCFStringEncodingASCII);
 			return 1;

Mac/Modules/cf/pycfbridge.c

@@ -292,7 +292,7 @@ PyCF_Python2CF_string(PyObject *src, CFStringRef *dst) {
 	UniChar *unichars;
 	
 	if (PyString_Check(src)) {
-		if (!PyArg_Parse(src, "es", NULL, &chars))
+		if (!PyArg_Parse(src, "es", "ascii", &chars))
 			return NULL; /* This error is more descriptive than the general one below */
 		*dst = CFStringCreateWithCString((CFAllocatorRef)NULL, chars, kCFStringEncodingASCII);
 		return 1;