If you're willing to use cdbs, it should be doable to work around upstream's removal of autotools support.
Example debian/rules file: #!/usr/bin/make -f include /usr/share/cdbs/1/rules/debhelper.mk include /usr/share/cdbs/1/class/cmake.mk include /usr/share/cdbs/1/class/makefile.mk cdbs and cmake would also have to be added to Build-Depends in debian/control. Ideally, Wesnoth would continue to support autotools, but that looks unlikely at the moment. :(
