Fixed ifdef guards.

CodingStyle

libknot/updates/xfr-in.h

src/common/acl.h

src/common/dynamic-array.h

src/common/errors.h

src/common/evqueue.h

src/common/evsched.h

src/common/general-tree.h

src/common/latency.h

src/common/print.h

src/common/ref.h

src/common/skip-list.h

src/common/slab/alloc-common.h

src/common/slab/malloc.h

src/common/slab/slab.h

src/common/sockaddr.h

src/knot/common.h

src/knot/conf/conf.h

src/knot/conf/logconf.h

src/knot/ctl/process.h