Fix portability issues discovered with fresh snap install.

ARCH=native fixes SIGILL issues on other amd64 processors.
Static library dependencies where supported.
Package libunbound2 in the snap.

contrib/snap/daemon.bash

@@ -1,5 +1,6 @@
 #!/bin/bash -e
 
+export LD_LIBRARY_PATH=${SNAP_LIBRARY_PATH}:${SNAP}/usr/lib/x86_64-linux-gnu
 export HOME=${SNAP_DATA}
 cd ${SNAP_DATA}