kernel-iph: Add a stub for a Windows IP Helper based networking backend

src/libcharon/plugins/kernel_iph/Makefile.am

@@ -0,0 +1,20 @@
+AM_CPPFLAGS = \
+	-I$(top_srcdir)/src/libstrongswan \
+	-I$(top_srcdir)/src/libhydra \
+	-I$(top_srcdir)/src/libcharon
+
+AM_CFLAGS = \
+	$(PLUGIN_CFLAGS)
+
+if MONOLITHIC
+noinst_LTLIBRARIES = libstrongswan-kernel-iph.la
+else
+plugin_LTLIBRARIES = libstrongswan-kernel-iph.la
+endif
+
+libstrongswan_kernel_iph_la_SOURCES = \
+	kernel_iph_plugin.h kernel_iph_plugin.c \
+	kernel_iph_net.h kernel_iph_net.c
+
+libstrongswan_kernel_iph_la_LDFLAGS = -module -avoid-version
+libstrongswan_kernel_iph_la_LIBADD = -liphlpapi