Enable mssql functions in PHP on a Directadmin machine.

I needed the mssql functions on 1 of our servers.
Note that this isn’t supported anymore in PHP 7.0 and higher.

First of all install the latest freetds from source (at the moment of writing 0.91)

If you not already have a custom php config in custombuild, create one:

Edit /usr/local/directadmin/custombuild/custom/fpm/configure.php56 and add:

somewhere in between.

Then build php:

And you’re done!