tools/null_state_gen: Add copyright notice to state output

along with info about what generated it.

Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
diff --git a/tools/null_state_gen/Makefile.am b/tools/null_state_gen/Makefile.am
index b131e0d..bf8cbdb 100644
--- a/tools/null_state_gen/Makefile.am
+++ b/tools/null_state_gen/Makefile.am
@@ -1,3 +1,4 @@
+GPU_TOOLS_PATH := $(top_srcdir)
 AM_CPPFLAGS = -I$(top_srcdir)
 
 noinst_PROGRAMS = intel_null_state_gen
@@ -14,7 +15,14 @@
 gens := 6 7 8 9
 
 h = /tmp/intel_renderstate_gen$$gen.c
-state_headers: intel_null_state_gen
+states: intel_null_state_gen
 	for gen in $(gens); do \
-		./intel_null_state_gen $$gen >$(h) ;\
+		head -n 22 intel_null_state_gen.c >$(h); \
+		if test -d $(GPU_TOOLS_PATH)/.git; then \
+			echo -n " * Generated by: " >>$(h); \
+			git describe >>$(h); \
+		fi; \
+		echo " */" >>$(h); \
+		echo "" >>$(h); \
+		./intel_null_state_gen $$gen >>$(h); \
 	done