SDL: Use SDL wrapped getenv function

SDL Commits
1 
From 9a5f7b17c60c534df73cce9dacfb3a02857b5fd0 Mon Sep 17 00:00:00 2001
From: Frank Praznik <[EMAIL REDACTED]>
Date: Wed, 11 Oct 2023 11:23:24 -0400
Subject: [PATCH] Use SDL wrapped getenv function

---
 src/video/wayland/SDL_waylandvideo.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/video/wayland/SDL_waylandvideo.c b/src/video/wayland/SDL_waylandvideo.c
index 9117410e23e6..d6c0d0e37bb4 100644
--- a/src/video/wayland/SDL_waylandvideo.c
+++ b/src/video/wayland/SDL_waylandvideo.c
@@ -129,8 +129,8 @@ static SDL_VideoDevice *Wayland_CreateDevice(void)
     struct wl_display *display;
 
     /* Are we trying to connect to or are currently in a Wayland session? */
-    if (!getenv("WAYLAND_DISPLAY")) {
-        const char *session = getenv("XDG_SESSION_TYPE");
+    if (!SDL_getenv("WAYLAND_DISPLAY")) {
+        const char *session = SDL_getenv("XDG_SESSION_TYPE");
         if (session && SDL_strcasecmp(session, "wayland")) {
             return NULL;
         }