Don't complain about comment lines in compiledump rules cleaner

Change-Id: Id0bfb8849f952f883e24bb9816fad6dc2cc5258f
diff --git a/tools/compiledump.py b/tools/compiledump.py
index c313cb9..39315c9 100755
--- a/tools/compiledump.py
+++ b/tools/compiledump.py
@@ -415,6 +415,8 @@
         f.write(line)
 
 def clean_config_line(line, minify, optimize, shrink):
+  if line.lstrip().startswith('#'):
+    return False
   if ('-injars' in line or '-libraryjars' in line or
       '-print' in line or '-applymapping' in line):
     return True