chore: import upstream snapshot with attribution

samples/android/tutorial-2-mixedprocessing/jni/CMakeLists.txt

@@ -0,0 +1,30 @@
+cmake_minimum_required(VERSION 3.6)
+
+set(target mixed_sample)
+project(${target} CXX)
+
+if (OPENCV_FROM_SDK)
+  message(STATUS "Using OpenCV from local SDK")
+  set(ANDROID_OPENCV_COMPONENTS "opencv_java" CACHE STRING "")
+else()
+  message(STATUS "Using OpenCV from AAR (Maven repo)")
+  set(ANDROID_OPENCV_COMPONENTS "OpenCV::opencv_java${OPENCV_VERSION_MAJOR}" CACHE STRING "")
+endif()
+
+message(STATUS "ANDROID_ABI=${ANDROID_ABI}")
+find_package(OpenCV REQUIRED COMPONENTS ${ANDROID_OPENCV_COMPONENTS})
+
+# For 16k pages support with NDK prior 27
+# Details: https://developer.android.com/guide/practices/page-sizes?hl=en
+if(ANDROID_SUPPORT_FLEXIBLE_PAGE_SIZES)
+  if(ANDROID_ABI STREQUAL arm64-v8a OR ANDROID_ABI STREQUAL x86_64)
+    set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,-z,max-page-size=16384")
+  endif()
+endif()
+
+file(GLOB srcs *.cpp *.c)
+file(GLOB hdrs *.hpp *.h)
+
+include_directories("${CMAKE_CURRENT_LIST_DIR}")
+add_library(${target} SHARED ${srcs} ${hdrs})
+target_link_libraries(${target} ${ANDROID_OPENCV_COMPONENTS})