*/Makefile.am: do not mix up AM_CFLAGS with AM_CPPFLAGS

Change-Id: I2c1d5f9c61714f487fbbe60603b2682f2c0a4c6b
diff --git a/src/coding/Makefile.am b/src/coding/Makefile.am
index 9a24f38..5ce3cbf 100644
--- a/src/coding/Makefile.am
+++ b/src/coding/Makefile.am
@@ -5,9 +5,8 @@
 
 AM_CPPFLAGS = \
 	-I"$(top_srcdir)/include" \
-	-I"$(top_builddir)/include" \
-	$(TALLOC_CFLAGS)
-AM_CFLAGS = -Wall
+	-I"$(top_builddir)/include"
+AM_CFLAGS = -Wall $(TALLOC_CFLAGS)
 
 if ENABLE_PSEUDOTALLOC
 AM_CPPFLAGS += -I$(top_srcdir)/src/pseudotalloc