builder: warn when using tcc with -prod

[ntrel]

Fixes #9261.

[spytheman]

This notice should have a way to be turned off, otherwise the -prod tests will need a way to filter it 🤔 .

[medvednikov]

I wouldn't say "not recommended", I'd say "incompatible" or "doesn't do anything" :)

[ntrel]

@medvednikov Wikipedia says tcc does do some simple optimisations:
"TCC performs a few optimizations, such as constant propagation for all operations, multiplications and divisions are optimized to shifts when appropriate, and comparison operators are specially optimized (by maintaining a special cache for the processor flags). It also does some simple register allocation, which prevents many extraneous save/load pairs inside a single statement. "