Revert "Remove libcpp_is_static"

This reverts commit 49b054d87c536f8a07aba08e9fd0ad2ea8a2382f.

Reason for revert: Reverting temporarily after talking to thomasanderson because I need to roll buildtools to fix something else... but the src side hasn't landed yet. buildtools ftw :/

Change-Id: I8227b98ee9d9c12b109108d9b60b070d6c01e56c
2 files changed