XMLRPC (aria2.getGlobalOption) broken.

Running master on Debian and Win64.

I have this tiny script that I occasionally use to display/update aria2 configuration via XMLRPC (ignore the changeGlobalOption stuff for now):

```python
import xmlrpclib
import sys

a = xmlrpclib.ServerProxy("http://localhost:6800/rpc").aria2
try:
  _,k,v = sys.argv
  a.changeGlobalOption({k:v})
except:
  pass
o = sorted(a.getGlobalOption().items(), key=lambda x: x[0])
for k,v in o:
  print k,v

```
Result:
`xmlrpclib.Fault: <Fault 1: 'No such method: aria2.getGlobalOption'`

I think jsonrpc does work with the same Debian build.