Warnings no longer discriminated by compilation-mode

[Manuel Gómez]

Hello,

After updating to ada-mode version 7.1.7 from 4.0 (it is the built-in 
version in Emacs 26.3), I've noticed that warnings emitted by the 
compiler are no longer colorized differently and the count in the 
modeline no longer counts them (second number in orange). Everything is 
considered an error. Even if I call M-x compile and run gprbuild by 
myself, the compilation-mode acts in the same way; so I suppose it has 
been set up by ada-mode 7 in some way. Is that intended?

Regards,

        Manuel