Make warning values consistent [Bug #17523]

	They should be affected, as well as `$VERBOSE`, by `-w`/`-W`
	options, not only in the main script but in scripts loaded by `-r`
	option too.
	---
	 ruby.c                        | 4 ++--
	 test/ruby/test_rubyoptions.rb | 9 +++++++++
	 2 files changed, 11 insertions(+), 2 deletions(-)