Add cscope files to .hgignore.

--HG--
extra : convert_revision : 82598579baf50cd258714c7e533b96bc6bd1305a
diff --git a/.hgignore b/.hgignore
index cbbb7b4..f536836 100644
--- a/.hgignore
+++ b/.hgignore
@@ -2,5 +2,7 @@
 build
 parser.out
 parsetab.py
+cscope.files
+cscope.out
 *.pyc
 *~