Fix CPPFLAGS Makefile.am for all stage4.
--- a/stage4/generate_c/Makefile.am Mon Dec 31 11:02:38 2012 +0100
+++ b/stage4/generate_c/Makefile.am Thu Jan 03 11:39:27 2013 +0100
@@ -6,5 +6,5 @@
libstage4_c_a_LIBADD = ../stage4.o
-libstage4_c_a_cppflags = -I../../../absyntax
+libstage4_c_a_CPPFLAGS = -I../../../absyntax
--- a/stage4/generate_iec/Makefile.am Mon Dec 31 11:02:38 2012 +0100
+++ b/stage4/generate_iec/Makefile.am Thu Jan 03 11:39:27 2013 +0100
@@ -6,5 +6,5 @@
libstage4_iec_a_LIBADD = ../stage4.o
-libstage4_iec_a_cppflags = -I../../../absyntax
+libstage4_iec_a_CPPFLAGS = -I../../../absyntax