envutil.rb: fix const name

* test/lib/envutil.rb (invoke_ruby): fix an exception class name.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49808 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/lib/envutil.rb

@@ -82,7 +82,7 @@ module EnvUtil
         while signal = signals.shift
           begin
             Process.kill signal, pgroup
-          rescue Errno::Invalid
+          rescue Errno::INVAL
             next
           rescue Errno::ESRCH
             break