dotnet/runtime#82317 implemented marshalled delegate support for NativeAOT via generating thunk pages.
We need the -Wl,-segprot,__THUNKS,rx,rx linker flag to set the correct permissions on the segment.

Note: depending on how we'll integrate the NativeAOT targets into xamarin-macios this might be automatically handled, filing this just so we don't forget it if we don't use the NativeAOT targets.