fix CFS source list: glob everything under shaders/

SConstruct

@@ -64,8 +64,7 @@ env.Append(BUILDERS = {'CFS' : Builder(action = CFS, emitter = CFS_emitter)})
 
 cfs_sources = [
         'src/ag.lua',
-        'shaders/wfobj.f.glsl',
-        'shaders/wfobj.v.glsl',
+        Glob('shaders/*'),
         ]
 
 env.CFS('cfs.cc', cfs_sources)