Add Microsoft.NET.HostModel.TestData (#505)

Adds a project with binary Mach-O files to test the ad-hoc signing in Microsoft.NET.HostModel.

src/Microsoft.NET.HostModel.TestData/MachO/src/main.c

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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+int add(int a, int b)
+{
+    return a + b;
+}
+
+int main()
+{
+    return add(2, 3) - add(1, 4);
+}

src/Microsoft.NET.HostModel.TestData/Microsoft.NET.HostModel.TestData.csproj

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+<Project Sdk="Microsoft.Build.NoTargets">
+  <ItemGroup>
+    <None Remove="MachO\src\*" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <MachOArch Include="arm64" />
+    <MachOArch Include="x86_64" />
+    <MachOCodesignOption Include="signed" />
+    <MachOCodesignOption Include="unsigned" />
+    <MachOCodesignOption Include="buildonly" />
+  </ItemGroup>
+
+  <Target Name="GenerateMachOBinaries">
+    <ItemGroup>
+      <_MachObjectFile Include="@(MachOArch)">
+        <Codesign>%(MachOCodesignOption.Identity)</Codesign>
+      </_MachObjectFile>
+      <MachObjectFile Include="@(_MachObjectFile->'$(MSBuildThisFileDirectory)MachO/%(Identity)/a.%(Codesign).out')" >
+        <Arch>%(_MachObjectFile.Identity)</Arch>
+      </MachObjectFile>
+    </ItemGroup>
+
+    <MakeDir Directories="%(MachObjectFile.RelativeDir)" />
+    <Exec Command="clang $(MSBuildThisFileDirectory)MachO/src/main.c -o %(MachObjectFile.Identity) -arch %(Arch)" />
+    <Exec Command="codesign --sign - %(MachObjectFile.Identity)"
+          Condition="'%(Codesign)' == 'signed'" />
+    <Exec Command="codesign --remove-signature %(MachObjectFile.Identity)"
+          Condition="'%(Codesign)' == 'unsigned'" />
+  </Target>
+
+</Project>

src/Microsoft.NET.HostModel.TestData/README.md

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+# Microsoft.NET.HostModel.TestData
+
+This project contains binary Mach-O files that are used to test the `Microsoft.NET.HostModel` implementation of ad-hoc signing.
+
+To produce the binary files, run `dotnet build -t:GenerateMachOBinaries` on a macOS machine with `clang` installed. The version of `clang` used for the files in the current commit is `Apple clang version 16.0.0 (clang-1600.0.26.3)`.