Enable cc_static_library by default

[keith]

This has been experimental for a while without issues filed.

[keith]

if folks think we should keep this flag for a while so that it can be manually disabled I can swap this PR to that approach. I'm not sure exactly what use case you would have for that besides banning the rule entirely (but that would likely only be a short term way to do that)

[pzembrod]

Hi @keith , cc_builtin_tests.sh seems to have changed since you created the PR. Could you rebase it to head? Sorry for the hassle ... :-)

[keith]

rebased and green!

[keith]

@bazel-io flag

[iancha1992]

@bazel-io fork 8.4.0