logging: hide logging from jetbrains idea

For now, the logging subsystem is hidden from CDT to prevent freezing of
the IDE.
CLion has the same issue, where the IDE becomes slow with big RAM spikes.
Fortunately, CLion automatically defines a macro __JETBRAINS_IDE__ that we
can use

Signed-off-by: Giuliano Franchetto <giuliano.franchetto@intellinium.com>