dep/msvc: Update SDL2 to 2.0.14

dep/msvc/sdl2/include/SDL_log.h

@@ -1,6 +1,6 @@
 /*
   Simple DirectMedia Layer
-  Copyright (C) 1997-2019 Sam Lantinga <slouken@libsdl.org>
+  Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
 
   This software is provided 'as-is', without any express or implied
   warranty.  In no event will the authors be held liable for any damages
@@ -61,7 +61,7 @@ extern "C" {
  *  at the VERBOSE level and all other categories are enabled at the
  *  CRITICAL level.
  */
-enum
+typedef enum
 {
     SDL_LOG_CATEGORY_APPLICATION,
     SDL_LOG_CATEGORY_ERROR,
@@ -94,7 +94,7 @@ enum
        };
      */
     SDL_LOG_CATEGORY_CUSTOM
-};
+} SDL_LogCategory;
 
 /**
  *  \brief The predefined log priorities