update libtun build script (#5055)

* Update compile-tun2socks.sh

* update libtun build script

compile-hevtun.sh

@@ -0,0 +1,40 @@
+#!/bin/bash
+set -o errexit
+set -o pipefail
+set -o nounset
+# Set magic variables for current file & dir
+__dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+__file="${__dir}/$(basename "${BASH_SOURCE[0]}")"
+__base="$(basename ${__file} .sh)"
+if [[ ! -d $NDK_HOME ]]; then
+	echo "Android NDK: NDK_HOME not found. please set env \$NDK_HOME"
+	exit 1
+fi
+TMPDIR=$(mktemp -d)
+clear_tmp () {
+  rm -rf $TMPDIR
+}
+trap 'echo -e "Aborted, error $? in command: $BASH_COMMAND"; trap ERR; clear_tmp; exit 1' ERR INT
+
+#build hev-socks5-tunnel
+mkdir -p "$TMPDIR/jni"
+pushd "$TMPDIR"
+
+echo 'include $(call all-subdir-makefiles)' > jni/Android.mk
+
+ln -s "$__dir/hev-socks5-tunnel" jni/hev-socks5-tunnel
+
+"$NDK_HOME/ndk-build" \
+    NDK_PROJECT_PATH=. \
+    APP_BUILD_SCRIPT=jni/Android.mk \
+	"APP_ABI=armeabi-v7a arm64-v8a x86 x86_64" \
+	APP_PLATFORM=android-21 \
+    NDK_LIBS_OUT="$TMPDIR/libs" \
+    NDK_OUT="$TMPDIR/obj" \
+    "APP_CFLAGS=-O3 -DPKGNAME=com/v2ray/ang/service" \
+    "APP_LDFLAGS=-Wl,--build-id=none -Wl,--hash-style=gnu" \
+
+cp -r "$TMPDIR/libs/"* "$__dir/libs/"
+
+popd
+rm -rf $TMPDIR