master doesn't compile with the full-mssql feature turned on

[maxnachlinger]

Looks like master is still unhappy when compiling with the full-mssql feature turned on. Here's the failing Travis build and here's the silly test project. I'm still quite new to Rust but plan on taking a crack at these errors to see if I can help :)

[pimeys]

Tested with the project, should work now with the latest master.