* Fix output stats collection.
* Plugins now found by default at $libdir/nmsg instead of lib/nmsg.
This fixes problem where plugins were not found with recent Debian
packages built with --libdir configure option (used to install
libraries in architecture specific directory). And
./configure --with-plugindir renamed to --with-pluginsdir.
* pkgconfig also depend on libprotobuf-c headers (for third-party
uses of libnmsg with pkgconfig).
Sponsored by: Farsight Security, Inc.
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