jruby-4611 fix introduces JVM option bug

-r and -I options allow optional white spaces. But JRUBY-4611 fix has new bug.

jruby.exe -r bar -J-verbose foo.rb
generates

jruby: unknown option -J-verbose

In contrast, the following commands work.

jruby.exe -r bar foo.rb
jruby.exe -J-verbose -r bar foo.rb

The following commands work, of course.

jruby.exe -rbar -J-verbose foo.rb
jruby.exe -J-verbsee -rbar foo.rb
jruby.exe -rbar foo.rb

The fix stops scanning for options from 'bar' because 'bar' does not start with '-', and jruby does not recognize JVM option -J.