commit ddf549b1 moved the CMakeLists.txt
for building radio libraries down to radio/. Previously, each option
would also declare a constant (e.g., OAI_USRP for USRP). With the
definition being below radio/, the executables don't have that define.

This commits removes the couple of defines that were in place:
- one that only shows a log, but it also applies for e.g., rfsimulator.
  It is also missing in the CI. Simply put it back
- two other places guard a commented(!) function call, which can go out
  entirely