Move iOS native libraries to iOS project (#2715)

Move iOS native libraries to iOS project

Co-authored-by: Dean Herbert <pe@ppy.sh>

osu.Framework.iOS.props

@@ -99,7 +99,7 @@
     <Reference Include="mscorlib" />
   </ItemGroup>
   <ItemGroup>
-    <NativeReference Include="..\osu.Framework.NativeLibs\ios\*.a">
+    <NativeReference Include="..\osu.Framework.iOS\*.a">
       <Kind>Static</Kind>
       <SmartLink>False</SmartLink>
       <ForceLoad>True</ForceLoad>

osu.Framework.iOS/osu.Framework.iOS.csproj

@@ -35,4 +35,12 @@
     <PackageReference Include="ppy.osuTK.iOS" Version="1.0.111" />
     <PackageReference Include="SixLabors.ImageSharp" Version="1.0.0-beta0006" />
   </ItemGroup>
+  <ItemGroup>
+    <NativeLibs Include="$(MSBuildThisFileDirectory)\*.a" />
+    <None Include="@(NativeLibs)">
+      <Pack>true</Pack>
+      <PackageCopyToOutput>true</PackageCopyToOutput>
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+  </ItemGroup>
 </Project>