[arch-dev-public] [signoff] shadow 4.1.2.1

I made some minor changes to shadow, and renamed some files in addition to the version bump. One important thing to note is that it apparently can't build shared anymore. I do now know if this breaks anything (libshadow)... if it does I will try to hack on it and get it to work, but actually I'm a little more comfortable with static binaries for this stuff anyway. Please test, and criticize. If someone can build for x86_64, that'd be appreciated too. Thanks, Aaron :wq