When building with "bundled" libraries, we get ODR violations
in misc. router libraries, and the X plugin.

These ODR violations are caused by our own shared libraries
exporting symbols from zlib and libevent.

To avoid the ODR violations, we build zlib and libevent with
-fvisibility=hidden

The patch also adds missing linker dependencies for libprobuf version files.

The patch also adds sanitizer environments to router unit testing,
so that these tests can benefit from existing ASAN/LSAN suppressions used for mtr tests.

Change-Id: I68f057b843d4b5821e581085866109c748eeac69
(cherry picked from commit 57ae3907345c1eb9c6da8a8ed3b28812d58c22e0)