Fix generators to make sure changes to rule inputs trigger correct rebuilds....

test/rules-rebuild/src/make-sources.py

Index: test/rules-rebuild/src/make-sources.py
===================================================================
--- test/rules-rebuild/src/make-sources.py	(revision 0)
+++ test/rules-rebuild/src/make-sources.py	(revision 0)
@@ -0,0 +1,15 @@
+#!/usr/bin/env python
+import sys
+
+assert len(sys.argv) == 4, sys.argv
+
+(in_file, c_file, h_file) = sys.argv[1:]
+
+def write_file(filename, contents):
+  open(filename, 'wb').write(contents)
+
+write_file(c_file, open(in_file, 'rb').read())
+
+write_file(h_file, '#define NAME "%s"\n' % in_file)
+
+sys.exit(0)