merge revision(s) r45901:

	envutil.rb: successfully terminated process

	* test/ruby/envutil.rb (FailDesc): allow successfully terminated
  process without a signal.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@45908 b2dd03c8-39d4-4d8f-98ff-823fe69b080e