SDL: updated the snake demo to be C++ compatible

SDL Commits
1 
From 5dd24926451065aa74079950422b0061bf3c698a Mon Sep 17 00:00:00 2001
From: captain0xff <[EMAIL REDACTED]>
Date: Wed, 12 Feb 2025 02:03:40 +0530
Subject: [PATCH] updated the snake demo to be C++ compatible

---
 examples/demo/01-snake/snake.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/examples/demo/01-snake/snake.c b/examples/demo/01-snake/snake.c
index a7f667d53378a..0aca862d7505e 100644
--- a/examples/demo/01-snake/snake.c
+++ b/examples/demo/01-snake/snake.c
@@ -208,7 +208,7 @@ void snake_step(SnakeContext *ctx)
     }
 }
 
-static int handle_key_event_(SnakeContext *ctx, SDL_Scancode key_code)
+static SDL_AppResult handle_key_event_(SnakeContext *ctx, SDL_Scancode key_code)
 {
     switch (key_code) {
     /* Quit. */
@@ -309,7 +309,7 @@ SDL_AppResult SDL_AppInit(void **appstate, int argc, char *argv[])
         return SDL_APP_FAILURE;
     }
 
-    AppState *as = SDL_calloc(1, sizeof(AppState));
+    AppState *as = (AppState *)SDL_calloc(1, sizeof(AppState));
     if (!as) {
         return SDL_APP_FAILURE;
     }