fix: link libunwind.a on linux-musl-x64

Author: jpnurmi

src/Sentry/Platforms/Native/buildTransitive/Sentry.Native.targets

@@ -38,6 +38,7 @@
     <NativeLibrary Include="$(MSBuildThisFileDirectory)..\sentry-native\$(RuntimeIdentifier)\libsentry-native.a" />
     <!-- See: https://github.com/dotnet/runtime/issues/97414 -->
     <NativeSystemLibrary Include="curl" />
+    <NativeSystemLibrary Include="libunwind.a" Condition="'$(RuntimeIdentifier)' == 'linux-musl-x64'" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(FrameworkSupportsNative)' == 'true' and ('$(RuntimeIdentifier)' == 'osx-x64' or '$(RuntimeIdentifier)' == 'osx-arm64')">