libsoup: fix build with host python3

Apply upstream patch to make tld-parser.py python3 compatible.

Fixes:
http://autobuild.buildroot.net/results/d22/d22edc19001037f9593f45444ed953f74ee6b806/



Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>