Added pre-built ICU for Android and files needed for cross-build of it

extern/icu/android/Readme.txt

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+This directory contains files needed for cross-build of IBM ICU 52.1 for Android
+on amd64 linux host. Data file (icudt52l.dat) should be taken from windows build.
+

extern/icu/android/aarch64/config.sh

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+#!/bin/sh
+
+. ../env.sh
+
+../source/configure --prefix=$(pwd)/prebuilt \
+    --host=aarch64-android-linux \
+    --enable-static=no \
+    --enable-shared \
+    --enable-extras=no \
+    --enable-strict=no \
+    --enable-icuio=no \
+    --enable-layout=no \
+    --enable-layoutex=no \
+    --enable-tools=no \
+    --enable-tests=no \
+    --enable-samples=no \
+    --enable-renaming \
+    --enable-dyload \
+    --with-cross-build=$CROSS_BUILD_DIR \
+    CFLAGS='-Os' \
+    CXXFLAGS='--std=c++11' \
+    LDFLAGS='-static-libstdc++' \
+    CC=aarch64-linux-android24-clang \
+    CXX=aarch64-linux-android24-clang++ \
+    AR=aarch64-linux-android-ar \
+    RANLIB=aarch64-linux-android-ranlib \
+    --with-data-packaging=archive

extern/icu/android/armv7a/config.sh

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+#!/bin/sh
+
+. ../env.sh
+
+../source/configure --prefix=$(pwd)/prebuilt \
+    --host=arm-linux-androideabi \
+    --enable-static=no \
+    --enable-shared \
+    --enable-extras=no \
+    --enable-strict=no \
+    --enable-icuio=no \
+    --enable-layout=no \
+    --enable-layoutex=no \
+    --enable-tools=no \
+    --enable-tests=no \
+    --enable-samples=no \
+    --enable-renaming \
+    --enable-dyload \
+    --with-cross-build=$CROSS_BUILD_DIR \
+    CFLAGS='-Os -march=armv7-a -mfloat-abi=softfp -mfpu=neon' \
+    CXXFLAGS='--std=c++11 -march=armv7-a -mfloat-abi=softfp -mfpu=neon' \
+    LDFLAGS='-static-libstdc++ -march=armv7-a -Wl,--fix-cortex-a8' \
+    CC=arm-linux-androideabi-clang \
+    CXX=arm-linux-androideabi-clang++ \
+    AR=arm-linux-androideabi-ar \
+    RANLIB=arm-linux-androideabi-ranlib \
+    --with-data-packaging=archive

extern/icu/android/env.sh

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+#!/bin/sh
+export CROSS_BUILD_DIR=`realpath ../linux`
+export ANDROID_NDK=${NDK}
+export ANDROID_TOOLCHAIN=${NDK_TOOLCHAIN}
+export PATH=$ANDROID_TOOLCHAIN/bin:$PATH

extern/icu/android/renameLinks.sh

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+MAJOR=52
+MINOR=1
+
+rm -f libicu*so
+for i in libicu*.${MINOR}; do mv $i `basename $i .${MINOR}`; done
+for i in libicu*.${MAJOR}; do ln -s $i `basename $i .${MAJOR}`; done