Android.mk for NDK build added.

src/frontends/android/README.ndk

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+To build this within the NDK several things have to be added in the jni
+folder:
+
+ - strongswan: The strongSwan sources.  This can either be an extracted tarball,
+   or a symlink to the Git repository.  To build from the repository the sources
+   have to be prepared first: ./autogen && ./configure && make && make distclean
+
+ - openssl: The OpenSSL sources.  Since the sources need to be changed to be
+   built on Android (and especially in the NDK), we provide a modified mirror
+   of the official Android OpenSSL version on git.strongswan.org.
+
+ - vstr: The Vstr string library.  Since cross-compiling this library is not
+   that easy with the configure script and Makefiles included in the tarball,
+   the easiest way to build it is still to use droid-gcc (as described on
+   wiki.strongswan.org).  The build script provided on the wiki builds the
+   library and copies the required header files to the configured installation
+   directory.  Please note that the Android.mk provided on the wiki (vstr.mk)
+   does not work in the NDK.  A replacement is already in place in jni/vstr.
+

src/frontends/android/jni/.gitignore

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+openssl
+strongswan
+vstr/libvstr.a
+vstr/include

src/frontends/android/jni/Android.mk

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+LOCAL_PATH := $(call my-dir)
+include $(CLEAR_VARS)
+
+strongswan_CHARON_PLUGINS := android-log openssl fips-prf random nonce pubkey \
+	pkcs1 pem xcbc hmac socket-default \
+	eap-identity eap-mschapv2 eap-md5
+
+strongswan_PLUGINS := $(strongswan_CHARON_PLUGINS)
+
+include $(LOCAL_PATH)/strongswan/Android.common.mk
+
+# includes
+strongswan_PATH := $(LOCAL_PATH)/strongswan
+libvstr_PATH := $(LOCAL_PATH)/vstr/include
+openssl_PATH := $(LOCAL_PATH)/openssl/include
+
+# CFLAGS (partially from a configure run using droid-gcc)
+strongswan_CFLAGS := \
+	-Wno-format \
+	-Wno-pointer-sign \
+	-Wno-pointer-arith \
+	-Wno-sign-compare \
+	-Wno-strict-aliasing \
+	-DHAVE___BOOL \
+	-DHAVE_STDBOOL_H \
+	-DHAVE_ALLOCA_H \
+	-DHAVE_ALLOCA \
+	-DHAVE_CLOCK_GETTIME \
+	-DHAVE_PTHREAD_COND_TIMEDWAIT_MONOTONIC \
+	-DHAVE_PRCTL \
+	-DHAVE_LINUX_UDP_H \
+	-DHAVE_STRUCT_SADB_X_POLICY_SADB_X_POLICY_PRIORITY \
+	-DHAVE_IPSEC_MODE_BEET \
+	-DHAVE_IPSEC_DIR_FWD \
+	-DOPENSSL_NO_EC \
+	-DOPENSSL_NO_ECDSA \
+	-DOPENSSL_NO_ECDH \
+	-DOPENSSL_NO_ENGINE \
+	-DCONFIG_H_INCLUDED \
+	-DCAPABILITIES \
+	-DCAPABILITIES_NATIVE \
+	-DMONOLITHIC \
+	-DUSE_IKEV1 \
+	-DUSE_IKEV2 \
+	-DUSE_VSTR \
+	-DDEBUG \
+	-DCHARON_UDP_PORT=4000 \
+	-DVERSION=\"$(strongswan_VERSION)\" \
+	-DDEV_RANDOM=\"/dev/random\" \
+	-DDEV_URANDOM=\"/dev/urandom\"
+
+# only for Android 2.0+
+strongswan_CFLAGS += \
+	-DHAVE_IN6ADDR_ANY
+
+include $(addprefix $(LOCAL_PATH)/,$(addsuffix /Android.mk, \
+		vstr \
+		openssl \
+		strongswan/src/libcharon \
+		strongswan/src/libhydra \
+		strongswan/src/libstrongswan \
+))

src/frontends/android/jni/vstr/Android.mk

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+LOCAL_PATH := $(call my-dir)
+
+include $(CLEAR_VARS)
+
+LOCAL_SRC_FILES := libvstr.a
+
+LOCAL_MODULE := libvstr
+
+LOCAL_PRELINK_MODULE := false
+
+include $(PREBUILT_STATIC_LIBRARY)