Added Unix guards

Added Unix guards on the `AfterBuild` MSBuild target, so `ilmerge.exe` won't be attempted to run under Mono, where it will fail with an exit code of `126` (whatever that means).

Author: asbjornu

src/GitVersionExe/GitVersionExe.csproj

@@ -129,7 +129,7 @@
           ]]></Code>
     </Task>
   </UsingTask>
-  <Target Name="AfterBuild" DependsOnTargets="Clean" Condition="$(NCrunch)==''">
+  <Target Name="AfterBuild" DependsOnTargets="Clean" Condition="$(NCrunch)=='' And '$(OS)' != 'Unix'">
     <MakeDir Directories="$(TargetDir)ILMergeTemp\" />
     <Exec Command="&quot;$(SolutionDir)tools\ilmerge.exe&quot;  /allowDup /keyfile:&quot;$(SolutionDir)key.snk&quot; /out:&quot;$(TargetDir)ILMergeTemp\$(TargetFileName)&quot; &quot;$(TargetPath)&quot; &quot;$(TargetDir)GitVersionCore.dll&quot;  &quot;$(TargetDir)LibGit2Sharp.dll&quot;  &quot;$(TargetDir)YamlDotNet.dll&quot; /target:exe /targetplatform:&quot;v4,$(FrameworkPathOverride)&quot; /ndebug /internalize " />
     <ItemGroup>

src/GitVersionTask/GitVersionTask.csproj

@@ -99,7 +99,7 @@
     </ItemGroup>
     <Delete Files="@(FilesToDelete)" />
   </Target>
-  <Target Name="AfterBuild" DependsOnTargets="Clean" Condition="$(NCrunch)==''">
+  <Target Name="AfterBuild" DependsOnTargets="Clean" Condition="$(NCrunch)=='' And '$(OS)' != 'Unix'">
     <MakeDir Directories="$(TargetDir)ILMergeTemp\" />
     <Exec Command="&quot;$(SolutionDir)tools\ilmerge.exe&quot;  /allowDup /keyfile:&quot;$(SolutionDir)key.snk&quot; /out:&quot;$(TargetDir)ILMergeTemp\$(TargetFileName)&quot; &quot;$(TargetPath)&quot; &quot;$(TargetDir)GitVersionCore.dll&quot;  &quot;$(TargetDir)LibGit2Sharp.dll&quot;  &quot;$(TargetDir)YamlDotNet.dll&quot; /target:library /targetplatform:&quot;v4,$(FrameworkPathOverride)&quot; /ndebug /internalize " />
     <ItemGroup>