Revert "try again"

This reverts commit e759adc79f77da29059de1522a2bacfce59621ea.
Revert "also inform gcrypt that we're threaded, since at least squeeze's version of libgnutls doesn't appear to do that for us"

This reverts commit 5bf4ebdbefa8764646a1ef2628ffa3d64f99db2d.
turning the gcrypt fixes into a dpatch so that it's specific to squeeze and easier to track
new changelog entry