[cmake] Build presets and System profiles (#135)

- Build Preset (Linux only): enables arch optimizations, e.g. generic,
  v3, zen2/4, armv8, armv9
- System Profiles: currently only steamdeck, uses an older sdl commit to
  fix virtual gamepad bug

Signed-off-by: crueter <crueter@eden-emu.dev>

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/135

externals/CMakeLists.txt

@@ -83,7 +83,18 @@ if (YUZU_USE_EXTERNAL_SDL2)
         set(SDL_FILE ON)
     endif()
 
-    add_subdirectory(SDL)
+    include(CPM)
+    set(CPM_SOURCE_CACHE ${CMAKE_SOURCE_DIR}/.cache/cpm)
+    set(CPM_USE_LOCAL_PACKAGES OFF)
+
+    if ("${YUZU_SYSTEM_PROFILE}" STREQUAL "steamdeck")
+        set(SDL_HASH cc016b0046)
+        set(SDL_PIPEWIRE OFF) # build errors out with this on
+    else()
+        set(SDL_HASH 2e4c12cd2c)
+    endif()
+
+    CPMAddPackage("gh:libsdl-org/SDL#${SDL_HASH}")
 endif()
 
 # ENet

externals/SDL

@@ -1 +0,0 @@
-Subproject commit 2e4c12cd2cb2c5d0b60ef2196b400339591e733c