Sync the Android build scripts with libsodium's

dist-build/android-arm.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+export CFLAGS="-Os -mthumb -marm -march=armv6"
+TARGET_ARCH=arm HOST_COMPILER=arm-linux-androideabi "$(dirname "$0")/android-build.sh"

dist-build/android-armv7.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+export CFLAGS="-Os -mfloat-abi=softfp -mfpu=vfpv3-d16 -mthumb -marm -march=armv7-a"
+TARGET_ARCH=armv7 HOST_COMPILER=arm-linux-androideabi "$(dirname "$0")/android-build.sh"

dist-build/android-build.sh

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+#! /bin/sh
+
+if [ -z "$ANDROID_NDK_HOME" ]; then
+    echo "You should probably set ANDROID_NDK_HOME to the directory containing"
+    echo "the Android NDK"
+    exit
+fi
+
+if [ ! -f ./configure ]; then
+	echo "Can't find ./configure. Wrong directory or haven't run autogen.sh?"
+	exit 1
+fi
+
+if [ "x$TARGET_ARCH" = 'x' ] || [ "x$HOST_COMPILER" = 'x' ]; then
+    echo "You shouldn't use android-build.sh directly, use android-[arch].sh instead"
+   exit 1
+fi   
+
+export MAKE_TOOLCHAIN="${ANDROID_NDK_HOME}/build/tools/make-standalone-toolchain.sh"
+
+export PREFIX="$(pwd)/dnscrypt-proxy-android-${TARGET_ARCH}"
+export TOOLCHAIN_DIR="$(pwd)/android-toolchain-${TARGET_ARCH}"
+export PATH="${PATH}:${TOOLCHAIN_DIR}/bin"
+
+export SODIUM_ANDROID_PREFIX=${SODIUM_ANDROID_PREFIX:-/tmp/libsodium-android-${TARGET_ARCH}}
+export CPPFLAGS="$CPPFLAGS -I${SODIUM_ANDROID_PREFIX}/include"
+export CPPFLAGS="$CPPFLAGS -DUSE_ONLY_PORTABLE_IMPLEMENTATIONS=1"
+export LDFLAGS="$LDFLAGS -L${SODIUM_ANDROID_PREFIX}/lib"
+
+rm -rf "${TOOLCHAIN_DIR}" "${PREFIX}"
+
+$MAKE_TOOLCHAIN --platform="${NDK_PLATFORM:-android-14}" \
+                --arch="$TARGET_ARCH" \
+                --install-dir="$TOOLCHAIN_DIR" && \
+./configure --host="${HOST_COMPILER}" \
+            --with-sysroot="${TOOLCHAIN_DIR}/sysroot" \
+            --prefix="${PREFIX}" \
+            --disable-soname-versions \
+            --disable-shared \
+            --disable-pie && \
+make clean && \
+make -j3 install && \
+echo "dnscrypt-proxy has been installed into $PREFIX"

dist-build/android-mips.sh

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+#!/bin/sh
+export CFLAGS="-Os"
+TARGET_ARCH=mips HOST_COMPILER=mipsel-linux-android "$(dirname "$0")/android-build.sh"

dist-build/android-x86.sh

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+#!/bin/sh
+export CFLAGS="-Os"
+TARGET_ARCH=x86 HOST_COMPILER=i686-linux-android "$(dirname "$0")/android-build.sh"