Compatibility with custom-unlispify-remove-prefixes
Merge pull request #518 from rnkn/master

Compatibility with custom-unlispify-remove-prefixes
Use cl-incf instead of cl

* yasnippet.el (yas--snippet-next-id, yas--real-line-beginning):
Use `cl-incf'.
Merge pull request #519 from syohex/use-cl-macro