Allow more cc_library_static targets to build.

- libc_openbsd_large_stack
- libc_openbsd

Also update the lib_dns comment as it makes more progress now (still fails).

Test: bp2build; bazel build //bionic/...
Test: USE_BAZEL_ANALYSIS=1 m libc

Change-Id: I54f104d359779420d181f195ecbfc9e1269e30be