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Match against local system libc first in libcdb (#2325)

* Match against local system libc first in libcdb

Don't do any requests if the libc currently in use on the system
running the exploit matches already. This is a small short circuit
optimization when the remote target uses the same libc as the
local one.

This looks at the libc loaded by the local shell binary. This appears
more dynamic than hardcoding library paths.

Refs #983

* Update CHANGELOG

* Handle missing SHELL envvar

* Fix hash lookup

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