Ignore System.EnterpriseServices.Thunk.dll

[matthid]

Leads to the following warning:

Yaaf.FSharp.Scriping Warning: 0 : Parsing and checking warnings:
        **** error: Problem reading assembly '': Exception of type 'Microsoft.FSharp.Compiler.ErrorLogger+InternalError' was thrown.
        **** error: internal error: PrepareToImportReferencedIlDll: cannot reference .NET netmodules directly, reference the containing assembly instead
        **** error: Problem reading assembly '': Error opening binary file 'C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.0\System.EnterpriseServices.Thunk.dll': C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.0\System.EnterpriseServices.Thunk.dll: bad cli header, rva 0
        **** error: Error opening binary file 'C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.0\System.EnterpriseServices.Thunk.dll': C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.0\System.EnterpriseServices.Thunk.dll: bad cli header, rva 0