renamed vecLib.framework, now can't use PAM, sudo, App Store... Error Code -8076
Just try restarting. Even if you can't start up normally, you can still probably start up from the recovery partition or in single user mode.

If nothing else works, try doing an upgrade install of OS X by starting up from the recovery partition and choosing Reinstall OS X. It downloads an OS X installer and replaces some system files with the initial versions. I have done it twice so far and it fixed multiple issues both times, so I have started to consider it as a troubleshooting step (but no-one ever does it when I recommend it here).