[advapi32/service #2] Check for duplicate displayname

[Paul Vriens]

Hi,

This adds a check for a duplicate displayname (which can be either an existing
servicename or an existing displayname).

Windows checks first if a service already exist before checking for duplicates. 
This also means we can't bail out in the 'while' loop.

We could maybe use EnumServicesStatusEx to enumerate for us (once that's
implemented).

Changelog
   Check for duplicate displayname

Cheers,

Paul.


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