Intercept.cc:210: error: 'enter_suid' was not declared in this scope
Intercept.cc:217: error: 'leave_suid' was not declared in this scope
We should just be including tools.h, but on some GCC the src/tools.h and
src/ip/tools.h include locations clash when building inside src/ip/.
For now we must reference the src/tools.h by its long path.