How to determine to which version of PostgreSQL a patch was applied

[Norberto Dellê <betodelle@xxxxxxxxx>]

Hi all

I would like to determine to which version of PostgreSQL a certain patch was applied.
I'm having trouble with a message flooding my log files and possibly affecting the server
performance, and I found a patch that may shed some light over the problem:
http://git.postgresql.org/gitweb/?p=postgresql.git;a=commitdiff;h=79b2ee20c8a041a85dd230c4e787bef22edae57b#patch1

How do I find the version to which this patch was applied?

Thanks

Norberto