Removed backend for old Android frontend patch

Moved the remaining DNS handler to a new plugin.

src/libcharon/plugins/android_dns/Makefile.am

@@ -0,0 +1,18 @@
+
+INCLUDES = -I$(top_srcdir)/src/libstrongswan -I$(top_srcdir)/src/libhydra \
+	-I$(top_srcdir)/src/libcharon
+
+AM_CFLAGS = -rdynamic
+
+if MONOLITHIC
+noinst_LTLIBRARIES = libstrongswan-android-dns.la
+else
+plugin_LTLIBRARIES = libstrongswan-android-dns.la
+endif
+
+libstrongswan_android_dns_la_SOURCES = \
+	android_dns_plugin.c android_dns_plugin.h \
+	android_dns_handler.c android_dns_handler.h
+
+libstrongswan_android_dns_la_LDFLAGS = -module -avoid-version
+libstrongswan_android_dns_la_LIBADD  = -lcutils