Remove dependencies on Boost.StaticAssert

[Lastique]

Boost.StaticAssert has been merged into Boost.Config, so remove the dependency.

[anarthal]

Looks like there's a bunch of CI failures due to this. For instance: https://drone.cpp.al/boostorg/mysql/1134/2/3

Is this because libraries like boost_align haven't merged PRs like this one yet? (I.e. can I safely ignore this error and expect it to go away in a couple of days?)

[Lastique]

Yes. test/cmake_test/CMakeLists.txt manually adds dependent libraries as subdirectories without actually tracking dependencies though the superproject. And since some of the dependent libraries have not yet merged the PRs and still reference Boost::static_assert, CMake can't find that target and errors out. This should resolve once those PRs are merged. You may want to wait until the dependent PRs are merged, just to be safe.

[anarthal]

Since we know the cause, I will merge this for now. Could I please ask that you notified us on the mailing list once all PRs have been merged so I can double-check? Thanks.

[Lastique]

Ok. In case if you want to monitor progress, the PRs are tracked in this issue.