Add <?> to silence raw type warning in Eclipse.

Test Plan: Sandcastle builds.

src/com/facebook/buck/rules/ParamInfo.java

diff --git a/src/com/facebook/buck/rules/ParamInfo.java b/src/com/facebook/buck/rules/ParamInfo.java
index 0c75f73..f46e593 100644
--- a/src/com/facebook/buck/rules/ParamInfo.java
+++ b/src/com/facebook/buck/rules/ParamInfo.java
@@ -259,7 +259,7 @@
       return true;
     }
 
-    if (value instanceof List && ((List) value).isEmpty()) {
+    if (value instanceof List && ((List<?>) value).isEmpty()) {
       return true;
     }