cc: make it work with modern lark

tools/cc.py

@@ -1490,7 +1490,7 @@ def parse_tree(tree, debug=False):
 
 def larkparse(f, debug=False):
     with open(GRAMMAR_FILE) as g:
-        asparser = lark.Lark(g.read())
+        asparser = lark.Lark(g.read(), maybe_placeholders=False)
     data = f.read()
     if isinstance(data, bytes):
         data = data.decode()

tools/ld.py

@@ -69,7 +69,7 @@ def dump(secmap):
 
 
 def parse_args():
-    parser = argparse.ArgumentParser(description='Assemble.')
+    parser = argparse.ArgumentParser(description='Link.')
     parser.add_argument('--debug', action='store_true',
                         help='print debug info')
     parser.add_argument('objfiles', metavar='O', nargs='+',