add script to build with Android NDK

tools/build_android.sh

@@ -0,0 +1,36 @@
+#!/bin/sh
+
+# 
+# Executable : ${HOME}/Android/Sdk/cmake/3.6.3155560/bin/cmake
+# arguments :
+# -H${HOME}/Dev/github-projects/googlesamples/android-ndk/hello-jni/app/src/main/cpp
+# -B${HOME}/Dev/github-projects/googlesamples/android-ndk/hello-jni/app/.cxx/cmake/arm7Debug/armeabi-v7a
+# -GAndroid Gradle - Ninja
+# -DANDROID_ABI=armeabi-v7a
+# -DANDROID_NDK=${HOME}/Android/Sdk/ndk-bundle
+# -DCMAKE_LIBRARY_OUTPUT_DIRECTORY=${HOME}/Dev/github-projects/googlesamples/android-ndk/hello-jni/app/build/intermediates/cmake/arm7/debug/obj/armeabi-v7a
+# -DCMAKE_BUILD_TYPE=Debug
+# -DCMAKE_MAKE_PROGRAM=${HOME}/Android/Sdk/cmake/3.6.3155560/bin/ninja
+# -DCMAKE_TOOLCHAIN_FILE=${HOME}/Android/Sdk/ndk-bundle/build/cmake/android.toolchain.cmake
+# -DANDROID_NATIVE_API_LEVEL=23
+# -DANDROID_TOOLCHAIN=clang
+# jvmArgs :
+# 
+
+CMAKE_TOOLCHAIN_FILE=/tools/android/android-ndk-r20-darwin/build/cmake/android.toolchain.cmake
+ANDROID_HOME=/tools/android/android-sdk-darwin
+ANDROID_NDK=${ANDROID_HOME}/ndk-bundle
+CMAKE_DIR=${ANDROID_HOME}/cmake/3.10.2.4988404/bin
+CMAKE=${CMAKE_DIR}/cmake
+NINJA=${CMAKE_DIR}/ninja
+
+${CMAKE} \
+    .. \
+    -DANDROID_NATIVE_API_LEVEL=23 \
+    -DANDROID_ABI=armeabi-v7a \
+    -DANDROID_TOOLCHAIN=clang \
+    -DANDROID_NDK=${ANDROID_NDK} \
+    -G'Unix Makefiles' \
+    -DCMAKE_TOOLCHAIN_FILE=${CMAKE_TOOLCHAIN_FILE} \
+    -DCMAKE_MAKE_PROGRAM=make \
+    -DUSE_WS=1