Stop explicitly setting runtime error reporting level in php.ini
Stop explicitly setting runtime error reporting level in php.ini

This was implicitly hiding all PHP7 deprecation notices, regardless of
more-visible settings. This is definitely not intentional, as PHP7
didn't exist at the time.

I'm guessing this was just to reduce CLI spam - otherwise, people
testing with hhvm-nightly on Travis will hopefully let us know.

refs facebook/hhvm#8121

hhvm/packaging,hhvm/packaging,hhvm/packaging