[geocode-glib] build: Use AM_CPPFLAGS rather than INCLUDES

[Philip Withnall <pwithnall src gnome org>]

commit 491dcd4f5a85d7a95876ff588f4d09d9b2ed16a0
Author: Philip Withnall <philip withnall collabora co uk>
Date:   Thu Oct 13 12:29:17 2016 +0100

    build: Use AM_CPPFLAGS rather than INCLUDES
    
    INCLUDES is deprecated and will be removed in a future version of
    automake. This fixes an automake warning.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=756311

 docs/Makefile.am |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/docs/Makefile.am b/docs/Makefile.am
index fc28e8b..cedb29a 100644
--- a/docs/Makefile.am
+++ b/docs/Makefile.am
@@ -73,9 +73,9 @@ expand_content_files=
 # CFLAGS and LDFLAGS for compiling gtkdoc-scangobj with your library.
 # Only needed if you are using gtkdoc-scangobj to dynamically query widget
 # signals and properties.
-# e.g. INCLUDES=-I$(top_srcdir) -I$(top_builddir) $(GTK_DEBUG_FLAGS)
+# e.g. AM_CPPFLAGS = -I$(top_srcdir) -I$(top_builddir) $(GTK_DEBUG_FLAGS)
 # e.g. GTKDOC_LIBS=$(top_builddir)/gtk/$(gtktargetlib)
-INCLUDES=-I$(top_srcdir) -I$(top_builddir) $(GEOCODE_CFLAGS)
+AM_CPPFLAGS = -I$(top_srcdir) -I$(top_builddir) $(GEOCODE_CFLAGS)
 GTKDOC_LIBS=$(top_builddir)/geocode-glib/libgeocode-glib.la
 
 # This includes the standard gtk-doc make rules, copied by gtkdocize.