Mask out /usr/include/tensorflow for image

Remove includes that's not already covered by common install masks.

BUG=b:120492582
TEST=emerge-gale tensorflow; cros deploy tensorflow; verified
/usr/include/tensorflow is empty.

Change-Id: Ic9bbecf8708e26401cec0a3203b75be12be2f7b9
Reviewed-on: https://chromium-review.googlesource.com/1419293
Commit-Ready: Bing Xue <bingxue@google.com>
Tested-by: Bing Xue <bingxue@google.com>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
diff --git a/common.sh b/common.sh
index ecc83e6..fa1aa5c 100644
--- a/common.sh
+++ b/common.sh
@@ -456,6 +456,7 @@
   /usr/include/c++
   /usr/include/nspr/*
   /usr/include/rpcsvc/*.x
+  /usr/include/tensorflow
   /usr/include/X11/*
   /usr/lib/debug
   /usr/lib/gopath