The git hash was being include in the shared library name. This leads to
polution of the /usr/lib directory. Instead, just use the latest tag in
the library suffix.

As a developer, you will need to clean up the /usr/lib/libbcc* files
whenever a new tag is created.

Fixes: #207
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>