sdl12-compat: sync SDL_endian.h with mainstream SDL2.

From 6d68bff0e950be9c550f3b3bc60e6fa4a86edd7d Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Sun, 31 Jul 2022 05:10:02 +0300
Subject: [PATCH] sync SDL_endian.h with mainstream SDL2.

---
 include/SDL/SDL_endian.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/SDL/SDL_endian.h b/include/SDL/SDL_endian.h
index 24773f2a..94cbb516 100644
--- a/include/SDL/SDL_endian.h
+++ b/include/SDL/SDL_endian.h
@@ -41,7 +41,7 @@ real SDL-1.2 available to you. */
 #ifdef __linux__
 #include <endian.h>
 #define SDL_BYTEORDER  __BYTE_ORDER
-#elif defined(__OpenBSD__)
+#elif defined(__OpenBSD__) || defined(__DragonFly__)
 #include <endian.h>
 #define SDL_BYTEORDER  BYTE_ORDER
 #elif defined(__FreeBSD__) || defined(__NetBSD__)