Bug#469015: downgrade to libc6 2.7-8 allows reconfigure of sbcl & common-lisp-controller to succeed

[Ben Diedrich]

I had the same problem with my unstable AMD64 system - sbcl &
common-lisp-controller would not successfully configure, because of
the "GC invariant lost" error. I downgraded to libc6, libc6-dev,
libc6-i386, and libc6-dev-i386 versions 2.7-8 using
snapshot.debian.net. Both sbcl and common-lisp-controller are now able
to configure without errors.

Ben