Eliminate unnecessary header files

src/common/fdset_kqueue.c

src/common/general-tree.c

src/knot/server/tcp-handler.c

src/knot/zone/zone-dump-text.c

src/libknot/tsig-op.c

src/libknot/updates/xfr-in.c

src/libknot/util/debug.c

src/libknot/util/libknot_error.c

src/libknot/zone/zone.c

src/zcompile/zcompile.c

src/zcompile/zcompile_main.c