Drop Python2 support.

platforms/apple/cv_build_utils.py

@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 """
-Common utilities. These should be compatible with Python 2 and 3.
+Common utilities. These should be compatible with Python3.
 """
 
 from __future__ import print_function

platforms/js/build_js.py

@@ -137,7 +137,6 @@ class Builder:
                "-DBUILD_opencv_stitching=OFF",
                "-DBUILD_opencv_java=OFF",
                "-DBUILD_opencv_js=ON",
-               "-DBUILD_opencv_python2=OFF",
                "-DBUILD_opencv_python3=OFF",
                "-DBUILD_EXAMPLES=ON",
                "-DBUILD_PACKAGE=OFF",

platforms/wince/readme.md

@@ -38,7 +38,6 @@ For headless WEC2013, this configuration may not be limited to but is known to w
 -DBUILD_opencv_videostab=OFF `
 -DBUILD_opencv_dnn=OFF `
 -DBUILD_opencv_java=OFF `
--DBUILD_opencv_python2=OFF `
 -DBUILD_opencv_python3=OFF `
 -DBUILD_opencv_java_bindings_generator=OFF `
 -DBUILD_opencv_python_bindings_generator=OFF `

platforms/winpack_dldt/build_package.py

@@ -379,7 +379,6 @@ class Builder:
 
             OPENCV_INSTALL_DATA_DIR_RELATIVE='../../src/opencv',
 
-            BUILD_opencv_python2='OFF',
             BUILD_opencv_python3='ON',
             PYTHON3_LIMITED_API='ON',
             OPENCV_PYTHON_INSTALL_PATH='python',