Add BUILD_MODULES conditional and move tests to the very end of the build.
Add BUILD_MODULES conditional and move tests to the very end of the
build.

jevonearth/rtpproxy,synety-jdebp/rtpproxy,sippy/rtpproxy,synety-jdebp/rtpproxy,synety-jdebp/rtpproxy,dsanders11/rtpproxy,synety-jdebp/rtpproxy,dsanders11/rtpproxy,sippy/rtpproxy,jevonearth/rtpproxy,sippy/rtpproxy,jevonearth/rtpproxy,dsanders11/rtpproxy,jevonearth/rtpproxy