NFC: Clean up runtime comments

Updating the todo list comments.

 - Windows builds are already using the runtime build system to build
   the runtimes so we can remove that from the todo list.

 - The Android SDK on Windows is currently cross-compiled with the new
   runtime build.

 - Catalyst builds have been going for a bit now, generating the
   necessary bits.

 - We moved things to a nested swiftmodule structure, which installs the
   entire directory, containing all of the emitted products.

The Glibc Linux builds should be coming soon.
We still have embedded to work on.

Author: etcwilde

Runtimes/Core/CMakeLists.txt

@@ -21,13 +21,9 @@
 
 # TODO:
 # Platform support:
-#   - Work on/Verify cross-compiling
-#   - Work on/Verify Windows and Linux native builds
+#   - Work on/Verify Linux native builds
 # Embedded
 #   -- -Xfrontend -emit-empty-object-file
-# Catalyst Support
-#   -- Will need shadow invocations to generate swiftmodules for Swift parts
-# Install *.abi.json, swiftdoc, and swiftsourceinfo
 
 cmake_minimum_required(VERSION 3.29)
 # TODO before requiring CMake 4.1 or later