Use utf8 encoding for .AddIn.

UTF16 doesn't play will with git and other unix tools.

BUG=

Review URL: https://codereview.chromium.org/10948016

git-svn-id: https://nativeclient-sdk.googlecode.com/svn/trunk/src@1417 050acbb0-2703-11df-ab0a-9f3f633ae91d
2 files changed