* Update the icu4c package
This PR makes several changes to the icu4c package
1. add updated version to 65.1
2. modify the default url as project has moved to github
3. set UTF-8 locale to support building from source files in UTF-8
format
Note that the older versions are not available on github so explicit urls
were used. This PR will close#14399.
* Consolidate the urls
Consolidate the URLs in the `version` directives by using an if test in
`url_for_version`.
* Put version and sha256 on same line
* Put top level url back
e7add79cba