MySQL HandlerSocket plugin port

[xpahos at gmail.com]

Hi.

I've made port for plugin, but after two days plugin stoped loading in MySQL.

http://host129.rax.ru/ports/handlersocket-mysql51-plugin.tar.bz2

Please, test this port on MySQL 5.1. Now it's building from github and
doesn't have stable version.

Thanks to Sahil Tandon for workaround with mysql sources.