zlev-option: Remove ZLEVELS cmake build option

CMakeLists.txt

@@ -14,7 +14,6 @@ option(TILES        "Build graphical tileset version"           "OFF")
 option(CURSES       "Build curses version"                      "ON")
 option(SOUND        "Support for in-game sounds & music"        "OFF")
 option(RELEASE      "Disable debug. Use it for user-ready buils." "OFF")
-option(ZLEVELS      "Enable experimental z-levels"              "OFF")
 option(USE_HOME_DIR "Use user's home directory for save files." "ON")
 option(LOCALIZE     "Support for language localizations. Also enable UTF support."        "ON")
 option(LANGUAGES    "Compile localization files for specified languages"  "")
@@ -131,7 +130,6 @@ ENDIF ( LUA )
 	MESSAGE(STATUS "SOUND                         : ${SOUND}")
 	MESSAGE(STATUS "RELEASE                       : ${RELEASE}")
 	MESSAGE(STATUS "LOCALIZE                      : ${LOCALIZE}")
-	MESSAGE(STATUS "ZLEVELS                       : ${ZLEVELS}")
 	MESSAGE(STATUS "USE_HOME_DIR                  : ${USE_HOME_DIR}\n")
 
 	MESSAGE(STATUS "LANGUAGES                     : ${LANGUAGES}\n")
@@ -221,10 +219,6 @@ IF(LOCALIZE)
 	ADD_DEFINITIONS(-DLOCALIZE)
 ENDIF(LOCALIZE)
 
-IF(ZLEVELS)
-	ADD_DEFINITIONS(-DZLEVELS)
-ENDIF(ZLEVELS)
-
 IF(USE_HOME_DIR)
 	ADD_DEFINITIONS(-DUSE_HOME_DIR)
 ENDIF(USE_HOME_DIR)