Fix Airline C# client build script [SWS-336]

[gregturn]

Arjen Poutsma opened SWS-336 and commented

We need to include a reference to the System.Web.Services assembly.
See http://forum.springframework.org/showthread.php?t=52253

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Referenced from: commits 66ba74b

[gregturn]

Arjen Poutsma commented

Closing issues for 1.5.1