[fluid-dev] Enable/disable logging at configure time

[Carlo Bramini]

Hello,

I would like to suggest the addition of an option "disable-logging" in the 
cmake script, that will allow the user to de-activate the log prints.
In the code, this just means a change like this into fluidsynth_priv.h:

#ifdef DISABLE_FLUID_LOG
#define FLUID_LOG
#else
#define FLUID_LOG    fluid_log
#endif

It saves some memory if someone wants (about 12KB on an ARM Thumb2 
microcontroller) and it would be selectable by the user (logging will be 
activated by default).

What do you think?
Sincerely.