update Source0 url

This was pointing to a newer URL on 2.4-dev branch, but the older URL on
2.4-release and 2.4-testing.

This PR is just for 2.4-dev to correct so it matches the rest of 2.4-*.
Merge pull request #1326 from beav/fix-source0

update Source0 url
Merge remote-tracking branch 'origin/2.4-dev' into 2.5-testing