libcompat: remove redundant path for ncurses

Reported by:	kevans

Makefile.libcompat

@@ -94,7 +94,7 @@ build${libcompat}: .PHONY
 	    DIRPRFX=${_dir}/ ${_t}
 .endfor
 .endfor
-.for _dir in lib/ncurses/ncurses lib/ncurses/ncurses ${_libmagic} ${_jevents}
+.for _dir in lib/ncurses/ncurses ${_libmagic} ${_jevents}
 .for _t in ${_obj} build-tools
 	${_+_}cd ${.CURDIR}/${_dir}; \
 	    WORLDTMP=${WORLDTMP} \