move dynamic_annotations.cc under libsysinfo.la

See github issue #1474 for immediate reason.

Note, this entire idea of number of convenience libraries is likely
simply artifact of Google's codebase past. We don't really need this
complexity. But I am holding big reorganization of this for after API
and ABI work. For now, simply moving dynamic_annotations.cc into
libsysinfo fixes things. Most of the code links both anyways. So lets
just do it.
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