Bump to cecil/xamarin-android-d15-3/82a2fe15 (#169)

Fixes: https://bugzilla.xamarin.com/show_bug.cgi?id=57889

commit 82a2fe15984df2b697c42b2fef5ccc17370007e3
    Author: Radek Doulik <[email protected]>
    Date:   Mon Jul 3 22:41:43 2017 +0200

        do not set scope.Start when start_instruction is null

         - this gets us to the original state how scope start was handled
           before
           jbevain/cecil@7c8e0f7

         - fixes #57889

         - without this change we get exception when writing mdb like this:

            The "LinkAssemblies" task failed unexpectedly. [C:\xms\xamarin-forms-samples\Templates\DataTemplateSelector\Droid\Selector.Droid.csproj]
            System.NotSupportedException: Specified method is not supported. [C:\xms\xamarin-forms-samples\Templates\DataTemplateSelector\Droid\Selector.Droid.csproj]
               at Mono.Cecil.Cil.InstructionOffset.get_Offset() [C:\xms\xamarin-forms-samples\Templates\DataTemplateSelector\Droid\Selector.Droid.csproj]
               at Mono.Cecil.Mdb.MdbWriter.WriteScope(ScopeDebugInformation scope, MethodDebugInformation info) [C:\xms\xamarin-forms-samples\Templates\DataTemplateSelector\Droid\Selector.Droid.csproj]
               at Mono.Cecil.Mdb.MdbWriter.WriteScopes(Collection`1 scopes, MethodDebugInformation info) [C:\xms\xamarin-forms-samples\Templates\DataTemplateSelector\Droid\Selector.Droid.csproj]
               at Mono.Cecil.Mdb.MdbWriter.WriteScope(ScopeDebugInformation scope, MethodDebugInformation info) [C:\xms\xamarin-forms-samples\Templates\DataTemplateSelector\Droid\Selector.Droid.csproj]
               at Mono.Cecil.Mdb.MdbWriter.WriteScopes(Collection`1 scopes, MethodDebugInformation info) [C:\xms\xamarin-forms-samples\Templates\DataTemplateSelector\Droid\Selector.Droid.csproj]
               at Mono.Cecil.Mdb.MdbWriter.WriteRootScope(ScopeDebugInformation scope, MethodDebugInformation info) [C:\xms\xamarin-forms-samples\Templates\DataTemplateSelector\Droid\Selector.Droid.csproj]
               at Mono.Cecil.Mdb.MdbWriter.Write(MethodDebugInformation info) [C:\xms\xamarin-forms-samples\Templates\DataTemplateSelector\Droid\Selector.Droid.csproj]
               at Mono.Cecil.Cil.CodeWriter.WriteResolvedMethodBody(MethodDefinition method) [C:\xms\xamarin-forms-samples\Templates\DataTemplateSelector\Droid\Selector.Droid.csproj]
               at Mono.Cecil.Cil.CodeWriter.WriteMethodBody(MethodDefinition method) [C:\xms\xamarin-forms-samples\Templates\DataTemplateSelector\Droid\Selector.Droid.csproj]
               at Mono.Cecil.MetadataBuilder.AddMethod(MethodDefinition method) [C:\xms\xamarin-forms-samples\Templates\DataTemplateSelector\Droid\Selector.Droid.csproj]
               at Mono.Cecil.MetadataBuilder.AddMethods(TypeDefinition type) [C:\xms\xamarin-forms-samples\Templates\DataTemplateSelector\Droid\Selector.Droid.csproj]
               at Mono.Cecil.MetadataBuilder.AddType(TypeDefinition type) [C:\xms\xamarin-forms-samples\Templates\DataTemplateSelector\Droid\Selector.Droid.csproj]
               at Mono.Cecil.MetadataBuilder.AddTypes() [C:\xms\xamarin-forms-samples\Templates\DataTemplateSelector\Droid\Selector.Droid.csproj]
               at Mono.Cecil.MetadataBuilder.BuildTypes() [C:\xms\xamarin-forms-samples\Templates\DataTemplateSelector\Droid\Selector.Droid.csproj]
               at Mono.Cecil.MetadataBuilder.BuildModule() [C:\xms\xamarin-forms-samples\Templates\DataTemplateSelector\Droid\Selector.Droid.csproj]
               at Mono.Cecil.MetadataBuilder.BuildMetadata() [C:\xms\xamarin-forms-samples\Templates\DataTemplateSelector\Droid\Selector.Droid.csproj]
               at Mono.Cecil.ModuleWriter.<>c.b__2_0(MetadataBuilder builder, MetadataReader _) [C:\xms\xamarin-forms-samples\Templates\DataTemplateSelector\Droid\Selector.Droid.csproj]
               at Mono.Cecil.ModuleDefinition.Read[TItem,TRet](TItem item, Func`3 read) [C:\xms\xamarin-forms-samples\Templates\DataTemplateSelector\Droid\Selector.Droid.csproj]
               at Mono.Cecil.ModuleWriter.BuildMetadata(ModuleDefinition module, MetadataBuilder metadata) [C:\xms\xamarin-forms-samples\Templates\DataTemplateSelector\Droid\Selector.Droid.csproj]
               at Mono.Cecil.ModuleWriter.Write(ModuleDefinition module, Disposable`1 stream, WriterParameters parameters) [C:\xms\xamarin-forms-samples\Templates\DataTemplateSelector\Droid\Selector.Droid.csproj]
               at Mono.Cecil.ModuleWriter.WriteModule(ModuleDefinition module, Disposable`1 stream, WriterParameters parameters) [C:\xms\xamarin-forms-samples\Templates\DataTemplateSelector\Droid\Selector.Droid.csproj]
               at Mono.Cecil.ModuleDefinition.Write(String fileName, WriterParameters parameters) [C:\xms\xamarin-forms-samples\Templates\DataTemplateSelector\Droid\Selector.Droid.csproj]
               at Mono.Linker.Steps.OutputStep.OutputAssembly(AssemblyDefinition assembly) [C:\xms\xamarin-forms-samples\Templates\DataTemplateSelector\Droid\Selector.Droid.csproj]
               at Mono.Linker.Steps.OutputStep.ProcessAssembly(AssemblyDefinition assembly) [C:\xms\xamarin-forms-samples\Templates\DataTemplateSelector\Droid\Selector.Droid.csproj]
               ...

Author: radekdoulik