Bug#795913: [rt.cpan.org #106498] Example workaround for existing apps

[Eric Wong]

For reference to other users who may encounter this bug but cannot patch
Mail::Thread itself, this is how I workaround the bug in the
public-inbox project using monkey patching:

http://public-inbox.org/meta/m/20150818-CPANRTBug106498-workaround%40v1.txt