Drop the legacy CMake options.

3.0 seems like an appropriate time to do that.

CMakeLists.txt

@@ -220,10 +220,6 @@ OCV_OPTION(OPENCV_WARNINGS_ARE_ERRORS "Treat warnings as errors"
 # ===================================================
 OCV_OPTION(CMAKE_VERBOSE "Verbose mode" OFF )
 
-# backward compatibility
-# ===================================================
-include(cmake/OpenCVLegacyOptions.cmake OPTIONAL)
-
 
 # ----------------------------------------------------------------------------
 #  Get actual OpenCV version number from sources

cmake/OpenCVLegacyOptions.cmake

-macro(ocv_legacy_option old superseded_by)
-  if(DEFINED ${old})
-    if(ARGV2)
-      set(${superseded_by} ${${old}} CACHE ${ARGV2} "Set via depricated ${old}" FORCE)
-    else()
-      set(${superseded_by} ${${old}} CACHE BOOL     "Set via depricated ${old}" FORCE)
-    endif()
-    unset(${old} CACHE)
-  endif()
-endmacro()
-
-ocv_legacy_option(BUILD_NEW_PYTHON_SUPPORT BUILD_opencv_python)
-ocv_legacy_option(BUILD_JAVA_SUPPORT       BUILD_opencv_java)
-ocv_legacy_option(WITH_ANDROID_CAMERA      BUILD_opencv_androidcamera)
-ocv_legacy_option(WITH_VIDEOINPUT          WITH_DSHOW)
-
-if(DEFINED OPENCV_BUILD_3RDPARTY_LIBS)
-  set(BUILD_ZLIB   ${OPENCV_BUILD_3RDPARTY_LIBS} CACHE BOOL "Set via depricated OPENCV_BUILD_3RDPARTY_LIBS" FORCE)
-  set(BUILD_TIFF   ${OPENCV_BUILD_3RDPARTY_LIBS} CACHE BOOL "Set via depricated OPENCV_BUILD_3RDPARTY_LIBS" FORCE)
-  set(BUILD_JASPER ${OPENCV_BUILD_3RDPARTY_LIBS} CACHE BOOL "Set via depricated OPENCV_BUILD_3RDPARTY_LIBS" FORCE)
-  set(BUILD_JPEG   ${OPENCV_BUILD_3RDPARTY_LIBS} CACHE BOOL "Set via depricated OPENCV_BUILD_3RDPARTY_LIBS" FORCE)
-  set(BUILD_PNG    ${OPENCV_BUILD_3RDPARTY_LIBS} CACHE BOOL "Set via depricated OPENCV_BUILD_3RDPARTY_LIBS" FORCE)
-  unset(OPENCV_BUILD_3RDPARTY_LIBS CACHE)
-endif()
-