Description of the problem / feature request:

CcSkylarkApiProvider should expose cc_libraryies with alwayslink = True, so that it is possible to properly add -Wl,--whole-source when we need to build the link flag ourselves, such as in rules_go.

What's the output of bazel info release?

release 0.21.0

Any other information, logs, or outputs that you want to share?

Ongoing dicussion at bazel-contrib/rules_go#1879