Blacklist the use of eval()

Summary: Depends on D10686.

Test Plan: N/A

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D11214

.arclint

@@ -90,6 +90,9 @@
         "16": "advice",
         "34": "error"
       },
+      "xhpast.blacklisted.function": {
+        "eval": "The eval() function should be avoided. It is potentially unsafe and makes debugging more difficult."
+      },
       "xhpast.php-version": "5.2.3",
       "xhpast.php-version.windows": "5.3.0"
     }