Use lowercase b in 'build'

Use lowercase `b` in `build` for improved compatibility with case-sensitive file systems.

Author: asbjornu

src/GitVersionTask/GitVersionTask.csproj

@@ -126,8 +126,8 @@
     <Copy SourceFiles="$(TargetDir)ILMergeTemp\GitVersionTask.dll" DestinationFolder="$(BuildDir)NuGetTaskBuild" Condition="Exists('$(TargetDir)ILMergeTemp\GitVersionTask.dll')" />
     <Copy SourceFiles="$(TargetDir)GitVersionTask.pdb" DestinationFolder="$(BuildDir)NuGetTaskBuild" Condition="Exists('$(TargetDir)GitVersionTask.pdb')" />
     <Copy SourceFiles="$(TargetDir)GitVersionTask.dll.mdb" DestinationFolder="$(BuildDir)NuGetTaskBuild" Condition="Exists('$(TargetDir)GitVersionTask.dll.mdb')" />
-    <Copy SourceFiles="$(ProjectDir)NugetAssets\GitVersionTask.targets" DestinationFolder="$(BuildDir)NuGetTaskBuild\Build\portable-net+sl+win+wpa+wp" />
-    <Copy SourceFiles="$(ProjectDir)NugetAssets\GitVersionTask.targets" DestinationFolder="$(BuildDir)NuGetTaskBuild\Build\dotnet" />
+    <Copy SourceFiles="$(ProjectDir)NugetAssets\GitVersionTask.targets" DestinationFolder="$(BuildDir)NuGetTaskBuild\build\portable-net+sl+win+wpa+wp" />
+    <Copy SourceFiles="$(ProjectDir)NugetAssets\GitVersionTask.targets" DestinationFolder="$(BuildDir)NuGetTaskBuild\build\dotnet" />
     <Copy SourceFiles="$(ProjectDir)NugetAssets\GitVersionTask.nuspec" DestinationFolder="$(BuildDir)NuGetTaskBuild" />
     <PepitaPackage.CreatePackageTask NuGetBuildDirectory="$(BuildDir)NuGetTaskBuild" MetadataAssembly="$(ILMergeTemp)GitVersionTask.dll" Version="$(GitVersion_NuGetVersion)" />
     <Delete Files="@(TempFiles)" />