libxt_addrtype: rename from libipt_addrtype

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>

diff --git a/extensions/libipt_addrtype.c b/extensions/libxt_addrtype.c
similarity index 100%
rename from extensions/libipt_addrtype.c
rename to extensions/libxt_addrtype.c

diff --git a/extensions/libipt_addrtype.man b/extensions/libxt_addrtype.man
similarity index 100%
rename from extensions/libipt_addrtype.man
rename to extensions/libxt_addrtype.man