i#1853: fix curiosity in reading off the end of PE resources
i#1853: fix curiosity in reading off the end of PE resources

Adds relaxation of a curiosity for a zero entry at the end of rsrc
resources in a PE file which does not contain enough room for a
non-zero proper entry.  We see this more and more on Win10 TH2 1511.

Fixes #1853

Review-URL: https://codereview.appspot.com/283120043

AmesianX/dynamorio,AmesianX/dynamorio,AmesianX/dynamorio,AmesianX/dynamorio,AmesianX/dynamorio