build: Use AM_CPPFLAGS in Makefile.am
Since automake 1.13 INCLUDES is depricates and causes a warning
Inspired from similar patches by Alexander Huemer for other osmocom
projects
Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
diff --git a/Makefile.am b/Makefile.am
index b5e0d59..d1638ec 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,7 +1,7 @@
AUTOMAKE_OPTIONS = foreign dist-bzip2 1.6
ACLOCAL_AMFLAGS = -I m4
-INCLUDES = $(all_includes) -I$(top_srcdir)/include
+AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include
SUBDIRS = include