android: Use static version of libcrypto

System.loadLibrary() searches in system directories first (at least in
recent releases), that is, our own build wouldn't actually get used.

src/frontends/android/src/org/strongswan/android/logic/CharonVpnService.java

@@ -660,7 +660,6 @@ public class CharonVpnService extends VpnService implements Runnable
 	 */
 	static
 	{
-		System.loadLibrary("crypto");
 		System.loadLibrary("strongswan");
 
 		if (MainActivity.USE_BYOD)

src/libstrongswan/Android.mk

@@ -70,7 +70,7 @@ LOCAL_SRC_FILES += $(call add_plugin, nonce)
 LOCAL_SRC_FILES += $(call add_plugin, openssl)
 ifneq ($(call plugin_enabled, openssl),)
 LOCAL_C_INCLUDES += $(openssl_PATH)
-LOCAL_SHARED_LIBRARIES += libcrypto
+LOCAL_STATIC_LIBRARIES += libcrypto_static
 endif
 
 LOCAL_SRC_FILES += $(call add_plugin, pem)