Revert "out-of-tree build: daemon"

This reverts commit 025dba7f803419f510fd8f085ce693838af82878.

If build and source directories are the same, you get this error:

make[3]: Leaving directory `/home/rjones/d/libguestfs/generator'
make[2]: Circular guestfs_protocol.c <- guestfs_protocol.c dependency dropped.
make[2]: Circular guestfs_protocol.h <- guestfs_protocol.h dependency dropped.
rm -f guestfs_protocol.h
ln  guestfs_protocol.h
ln: accessing `guestfs_protocol.h': No such file or directory