* (bug 3786) Experimental support for MySQL 4.1/5.0 utf8 charset mode

* (bug 3786) Experimental support for MySQL 4.1/5.0 utf8 charset mode
  NOTE: Enabling this may break existing wikis, and still doesn't
  work for all Unicode characters due to MySQL limitations.

The $wgDBmysql5 option will run 'SET NAMES utf8' on connection to the
server so it knows we're speaking UTF-8 to it; switching it on/off
can cause interpretation of non-blob columns to change depending
on the charset options set on the server.