[SDL2] On Win, build and link statically.

Keep using system lib dynamically on Unix.

src/xenia/hid/sdl/premake5.lua

@@ -15,16 +15,4 @@ project("xenia-hid-sdl")
   defines({
   })
   local_platform_files()
-
-  filter("platforms:Windows")
-    -- On linux we build against the system version (libsdl2-dev)
-    includedirs({
-      project_root.."/third_party/SDL2-devel-VC/include/",
-    })
-    libdirs({
-      project_root.."/third_party/SDL2-devel-VC/lib/x64/",
-    })
-    -- Copy the dll to the output folder
-    postbuildcommands({
-      "{COPY} %{prj.basedir}/"..project_root.."/third_party/SDL2-devel-VC/lib/x64/SDL2.dll %{cfg.targetdir}",
-    })
+  sdl2_include()

src/xenia/hid/sdl/sdl_input_driver.h

@@ -10,12 +10,11 @@
 #ifndef XENIA_HID_SDL_SDL_INPUT_DRIVER_H_
 #define XENIA_HID_SDL_SDL_INPUT_DRIVER_H_
 
-#include <SDL2/SDL.h>
-
 #include <array>
 #include <atomic>
 #include <mutex>
 
+#include "SDL.h"
 #include "xenia/hid/input_driver.h"
 
 #define HID_SDL_USER_COUNT (4)