FreeBSD/src 2a9e60b (r320396)share/mk bsd.lib.mk

Stash work for adding runtime coverage support to bsd.lib.mk

The initial work uses static libraries instead of dynamic libraries, for
parity with pico-style libraries.

I suspect this approach is slightly flawed, but I wanted to stash the WiP,
just in case.
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+38-3share/mk/bsd.lib.mk
+38-31 files

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