fix pygtk.require() to work ok in GNU

src/gajim.py

@@ -24,6 +24,9 @@ exec python -OOt "$0" ${1+"$@"}
 		
 import sys
 import pygtk
+import os
+if not os.name == 'nt': # py2exe only in windows
+		pygtk.require('2.0') # py2exe fails on this
 try:
 	import gtk
 except RuntimeError, msg:
@@ -33,9 +36,6 @@ except RuntimeError, msg:
 		
 import gobject
 import pango
-import os
-if not os.name == 'nt': # py2exe only in windows
-		pygtk.require('2.0') # py2exe fails on this
 import sre
 import signal
 import getopt