On the 1.8.x branch, merge r1745515 and r1746364 from trunk.
* r1745515, r1746364 Update serf download URIs to ASF. Justification: Resolves build script issues since the old google code URI is 404 now. Notes: Merge with --accept=working due to absence of tools/dev/build-svn-deps-win.pl on the 1.8 branch. Votes: +1: stefan2, stsp -0: rhuijben (Makefile.svn is patched but not fixed) -0 (non-binding): luke1410 (r1700130 is missing - will have to create a backport branch)