npgsql - Npgsql2: Fixed build target dependency to include

Log Message:
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Fixed build target dependency to include createAssemblyInfo target. Now, when running build it generates the assemblyinfo.cs file correctly. Thanks Daniel Nauck for heads up.

Modified Files:
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Npgsql2/src:
Npgsql.build (r1.19 -> r1.20)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/npgsql/Npgsql2/src/Npgsql.build?r1=1.19&r2=1.20)