[cmake] enable clang-cl and WoA builds (#348)

Compilation and CMake fixes for both Windows on ARM and clang-cl, meaning Windows can now be built on both MSVC and clang on both amd64 and aarch64.

Compiling on clang is *dramatically* faster so this should be useful for CI.

Co-authored-by: crueter <crueter@eden-emu.dev>
Co-authored-by: crueter <crueter@crueter.xyz>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/348
Reviewed-by: CamilleLaVey <camillelavey99@gmail.com>
Reviewed-by: crueter <crueter@eden-emu.dev>
Co-authored-by: lizzie <lizzie@eden-emu.dev>
Co-committed-by: lizzie <lizzie@eden-emu.dev>

.patch/unordered-dense/0001-cmake.patch

@@ -1,22 +0,0 @@
-From e59d30b7b12e1d04cc2fc9c6219e35bda447c17e Mon Sep 17 00:00:00 2001
-From: Lizzie <159065448+Lizzie841@users.noreply.github.com>
-Date: Fri, 16 May 2025 04:12:13 +0100
-Subject: [PATCH] Update CMakeLists.txt
-
----
- CMakeLists.txt | 2 +-
- 1 file changed, 1 insertion(+), 1 deletion(-)
-
-diff --git a/CMakeLists.txt b/CMakeLists.txt
-index b5f4c4f..c5c6f31 100644
---- a/CMakeLists.txt
-+++ b/CMakeLists.txt
-@@ -24,7 +24,7 @@ target_include_directories(
- 
- target_compile_features(unordered_dense INTERFACE cxx_std_17)
- 
--if(_unordered_dense_is_toplevel_project)
-+if(_unordered_dense_is_toplevel_project OR UNORDERED_DENSE_INSTALL)
-     # locations are provided by GNUInstallDirs
-     install(
-         TARGETS unordered_dense