fix processing of non-switch arguments

Without this fix AdditionalArguments were showing
with with a '-' at the beginning.

BUG=153682

Review URL: https://codereview.chromium.org/11046011

git-svn-id: https://nativeclient-sdk.googlecode.com/svn/trunk/src@1426 050acbb0-2703-11df-ab0a-9f3f633ae91d
2 files changed