`report_internal_error` does not respect `stdout` and `stderr` in several places

When using mypy as a library and passing stdout and stderr into build.build it is reasonable to expect that it will be respected for all cases.

But, there are several places where report_internal_error does not respect the passed value and just dumps everything into sys.stdout:

• checker.py
• checkexpr.py
• semanal.py

But, there also places where report_internal_error is called with the correct streams:

• build.py

I suggest to add stdout and stderr props to Options class. It would be possible to easily work with them from all these three missed places.

Inizia tracciando stdout e stderr da build.build attraverso la classe Options, quindi esamina le chiamate a report_internal_error in checker.py, checkexpr.py, semanal.py e build.py. Il lavoro è completato quando i tre punti di chiamata mancanti usano gli stream passati invece di sys.stdout, preservando il comportamento esistente in build.py.