slicc: tweak file enumeration for scons

Right now .cc and .hh files are handled separately, but then
they're just munged together at the end by scons, so it
doesn't buy us anything.  Might as well munge from the start
since we'll eventually be adding generated Python files
to the list too.

src/mem/protocol/SConscript

@@ -69,9 +69,7 @@ def slicc_emitter(target, source, env):
     for name in slicc.load(files, verbose=True):
         print "    %s" % name
 
-    hh,cc = slicc.files()
-    target.extend(sorted(hh))
-    target.extend(sorted(cc))
+    target.extend(sorted(slicc.files()))
     return target, source
 
 def slicc_action(target, source, env):