jruby -S picks up script from local directory

jruby -S looks for scripts in the current directory, even when not asked to. It should only look for them in PATH (maybe RUBYLIB?)

$ jruby -S spec spec/common_spec.rb
Error opening script file: /Users/assaf/work/buildr/spec (No such file or directory)

This shows what happens if there's a directory of the same name, but even if it was a file, it should not be picked up as a script unless listed in the PATH.