THRIFT-856. cpp: Building cpp library fails on OS X with malloc and free not being declared in scope

This patch adds include which seems to fix the problem for some people.

Patch: James Clarke

git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@992013 13f79535-47bb-0310-9956-ffa450edef68
1 file changed