Originally, this code was not yet in an official upstream git repo.
However, it has been for many months, so let's remove our local copy
and use upstream git repositories like for all the other modules.
Change-Id: I2c616fb865df32cfec323d42e5d0d06de40c497b
Let's use the preprocessor to avoid IPA_Emulation pulling *all*
dependencies into each and any of our projects. The code readability
suffers a bit from the many #ifdefs, but compilation speed increases
if we don't have to pull in all those (recursive) dependencies.
After all, a BTS test case will never need SCCP, GSUP or MGCP.
Change-Id: Ic0231adbd2171214de133d26b3fbf36130ee8aa0