Remove unused empty Ryujinx.Audio.Backends project (#2919)

Ryujinx.Audio.Backends/Ryujinx.Audio.Backends.csproj

@@ -1,32 +0,0 @@
-<Project Sdk="Microsoft.NET.Sdk">
-
-  <PropertyGroup>
-    <TargetFramework>net6.0</TargetFramework>
-    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
-  </PropertyGroup>
-
-  <ItemGroup>
-    <PackageReference Include="OpenTK.NetStandard" Version="1.0.5.32" />
-  </ItemGroup>
-
-  <ItemGroup>
-    <ProjectReference Include="..\Ryujinx.Audio\Ryujinx.Audio.csproj" />
-    <ProjectReference Include="..\Ryujinx.Common\Ryujinx.Common.csproj" />
-  </ItemGroup>
-
-  <ItemGroup>
-    <ContentWithTargetPath Include="SoundIo\Native\libsoundio\libs\libsoundio.dll">
-      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
-      <TargetPath>libsoundio.dll</TargetPath>
-    </ContentWithTargetPath>
-    <ContentWithTargetPath Include="SoundIo\Native\libsoundio\libs\libsoundio.dylib">
-      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
-      <TargetPath>libsoundio.dylib</TargetPath>
-    </ContentWithTargetPath>
-    <ContentWithTargetPath Include="SoundIo\Native\libsoundio\libs\libsoundio.so">
-      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
-      <TargetPath>libsoundio.so</TargetPath>
-    </ContentWithTargetPath>
-  </ItemGroup>
-
-</Project>