[NaCl Addin] Fix building of libraries in MSVS.

This also adds unit tests that build static and shared
libraries so this cannot happen again.

I've also added copyright header to all C# files.

BUG=

Review URL: https://codereview.chromium.org/11360111

git-svn-id: https://nativeclient-sdk.googlecode.com/svn/trunk/src@1465 050acbb0-2703-11df-ab0a-9f3f633ae91d
16 files changed