* common.mk (btest, test-sample, test-knownbugs, test-all, test-ruby):
pass common options by TESTOPTS.
* tool/rubytest.rb: pass ARGV from make to sample/test.rb.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@35839 b2dd03c8-39d4-4d8f-98ff-823fe69b080e