Proxy protocol modules now separate

Hi all,

I've separated all the proxy protocol modules into free standing modules.

Please test this for me to see if this builds properly and works. Using
--enable-proxy you also enable the three protocol modules, any further
modules would need to be enabled by doing --enable-proxy-ldap or
--enable-proxy-sql.

Don't forget to do a ./buildconf so the build scripts are updated.

Regards,
Graham
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