- configure wrapper had bash syntax some places; replaced w/ sh syntax
- Added FindOpenSSL module. The one that ships with CMake does not
allow for specifying a non-standard location.
- datadir configure option changed to be relative to prefix. This
simplifies the packaging from having to consider absolute paths.
- Added macro for changing install_name of shared libs that need to
ship with precompiled Bro for OS X. This is only the optional
libmagic and libGeoIP for now.
