automake: replace INCLUDES by AM_CPPFLAGS

INCLUDES are now deprecated and throw warnings when using automake 1.13.
We now also differentiate AM_CPPFLAGS and AM_CFLAGS, where includes and
defines are passed to AM_CPPFLAGS only.

src/libcharon/plugins/error_notify/Makefile.am

@@ -1,10 +1,12 @@
-
-INCLUDES = -I$(top_srcdir)/src/libstrongswan -I$(top_srcdir)/src/libhydra \
-	-I$(top_srcdir)/src/libcharon
-
-AM_CFLAGS = -rdynamic \
+AM_CPPFLAGS = \
+	-I$(top_srcdir)/src/libstrongswan \
+	-I$(top_srcdir)/src/libhydra \
+	-I$(top_srcdir)/src/libcharon \
 	-DIPSEC_PIDDIR=\"${piddir}\"
 
+AM_CFLAGS = \
+	-rdynamic
+
 if MONOLITHIC
 noinst_LTLIBRARIES = libstrongswan-error-notify.la
 else