Issue an internal warning on first deprecated function call

[Andrew Cagney]

>> (gdb) maint internal-error
>> /home/scratch/GDB/src/gdb/maint.c:121: gdb-internal-error: internal 
>> maintenance
>> An internal GDB error was detected.  This may make further
>> debugging unreliable.  Quit this debugging session? (y or n) n
>> Create a core file containing the current state of GDB? (y or n) n
>> (gdb)
>> s/error/warning/
> 
> 
> Would it be better if the message was more explanatory?
> 'internal maintenance - deprecated [multi-arch] function call' 
> 
> I have this feeling that we will want to make this message as clear
> as possible. We want to say "Hey you! Wakeup! Fix it or lose it!"

Yes, definitly, the above was just to illustrate the interaction.

Andrew