add script to build Android libraries for all platforms

scripts/build-android-libs.sh

@@ -0,0 +1,57 @@
+#!/bin/bash
+
+# This script builds binaries for all Android architectures. They are placed in the directory 'out'.
+# The libheif source has to be unpacked to a directory named "libheif-1.16.2" (replace version number with the value of HEIF_VERSION below).
+
+# The configuration below builds libheif with heic decoding only.
+
+# Set these variables to suit your needs
+NDK_PATH= ... # for example .../android-sdk/sdk/ndk/25.1.8937393
+TOOLCHAIN=clang
+ANDROID_VERSION=19 # the minimum version of Android to support
+HEIF_VERSION=1.16.2
+
+function build {
+    mkdir -p build/$1
+    cd build/$1
+    cmake -G"Unix Makefiles" \
+	  -DCMAKE_ASM_FLAGS="--target=arm-linux-androideabi${ANDROID_VERSION}" \
+	  -DCMAKE_TOOLCHAIN_FILE=${NDK_PATH}/build/cmake/android.toolchain.cmake \
+	  -DANDROID_ABI=$1 \
+	  -DANDROID_ARM_MODE=arm \
+	  -DANDROID_PLATFORM=android-${ANDROID_VERSION} \
+	  -DANDROID_TOOLCHAIN=${TOOLCHAIN} \
+    	  -DENABLE_PLUGIN_LOADING=OFF \
+	  -DWITH_AOM_DECODER=OFF \
+	  -DWITH_AOM_DECODER_PLUGIN=OFF \
+	  -DWITH_AOM_ENCODER=OFF \
+	  -DWITH_DAV1D=OFF \
+	  -DWITH_DEFLATE_HEADER_COMPRESSION=OFF \
+	  -DWITH_EXAMPLES=OFF \
+	  -DWITH_GDK_PIXBUF=OFF \
+	  -DWITH_LIBDE265=ON \
+	  -DWITH_LIBDE265_PLUGIN=OFF \
+	  -DWITH_RAV1E=OFF \
+	  -DWITH_SvtEnc=OFF \
+	  -DWITH_X265=OFF \
+	  -DCMAKE_INSTALL_PREFIX=../../out/$1 \
+	  -DCMAKE_BUILD_TYPE=Release \
+	  -Dld-version-script=OFF \
+	  ../../libheif-${HEIF_VERSION}
+    make VERBOSE=1
+    make install
+    cd ../..
+
+    mkdir -p out/$1
+}
+
+rm -rf build out
+
+
+build armeabi-v7a ON
+build arm64-v8a ON
+build x86 OFF
+build x86_64 OFF
+
+rm -rf build
+rm -rf out/*/share