Consolidate path calculations

Author: AArnott

LibGit2Sharp/CodeGenerator.targets

@@ -2,10 +2,11 @@
 <Project InitialTargets="GenerateCodeFirst">
   <PropertyGroup>
     <CodeGeneratorConfiguration Condition=" '$(CodeGeneratorConfiguration)' == '' ">Debug</CodeGeneratorConfiguration>
+    <CodeGenerationOutputPath>$(MSBuildProjectDirectory)\..\CodeGeneration\bin\$(CodeGeneratorConfiguration)\netstandard1.3\</CodeGenerationOutputPath>
   </PropertyGroup>
 
   <ItemGroup>
-    <GeneratorAssemblySearchPaths Include="$(MSBuildProjectDirectory)\..\CodeGeneration\bin\$(Configuration)\netstandard1.3">
+    <GeneratorAssemblySearchPaths Include="$(CodeGenerationOutputPath)">
       <Visible>false</Visible>
     </GeneratorAssemblySearchPaths>
   </ItemGroup>
@@ -28,8 +29,8 @@
     </PropertyGroup>
   </Target>
 
-  <UsingTask TaskName="GenerateNativeDllNameTask" AssemblyFile="..\CodeGeneration\bin\$(CodeGeneratorConfiguration)\netstandard1.3\CodeGeneration.dll" />
-  <UsingTask TaskName="GenerateUniqueIdentifierTask" AssemblyFile="..\CodeGeneration\bin\$(CodeGeneratorConfiguration)\netstandard1.3\CodeGeneration.dll" />
+  <UsingTask TaskName="GenerateNativeDllNameTask" AssemblyFile="$(CodeGenerationOutputPath)CodeGeneration.dll" />
+  <UsingTask TaskName="GenerateUniqueIdentifierTask" AssemblyFile="$(CodeGenerationOutputPath)CodeGeneration.dll" />
 
   <Target Name="GenerateNativeDllNameCs">
     <GenerateNativeDllNameTask InputHashFile="@(EmbeddedResource)"