Restore proper support for Python 2.5 on Windows by including curl tool again.

NSIS_Installer.nsi

@@ -84,6 +84,7 @@
   RMDir /r "${idir}\interfaces\wizard"
   RMDir /r "${idir}\interfaces\Config"
   RMDir    "${idir}\interfaces"
+  RMDir /r "${idir}\win\curl"
   RMDir /r "${idir}\win\par2"
   RMDir /r "${idir}\win\unrar"
   RMDir /r "${idir}\win\unzip"

package.py

@@ -570,7 +570,7 @@ elif target in ('binary', 'installer'):
 
     ############################
     # Copy Curl if needed
-    if not (sys.version_info > (2, 5)):
+    if sys.version_info < (2, 6):
         # Curl for Python 2.5
         os.system(r'unzip -o win\curl\curl.zip -d dist\lib')