SDL: Use <sys/endian.h> for endian detection on NetBSD

SDL Commits
1 
From 98f2e38b26abd6f6470546e19fb33106ae988359 Mon Sep 17 00:00:00 2001
From: nia <[EMAIL REDACTED]>
Date: Sat, 12 Jun 2021 09:42:54 +0200
Subject: [PATCH] Use <sys/endian.h> for endian detection on NetBSD

Signed-off-by: Nia Alarie <nia@NetBSD.org>
---
 include/SDL_endian.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/SDL_endian.h b/include/SDL_endian.h
index 0a8e204a48..205b793579 100644
--- a/include/SDL_endian.h
+++ b/include/SDL_endian.h
@@ -65,7 +65,7 @@ _m_prefetch(void *__P)
 #elif defined(__OpenBSD__)
 #include <endian.h>
 #define SDL_BYTEORDER  BYTE_ORDER
-#elif defined(__FreeBSD__)
+#elif defined(__FreeBSD__) || defined(__NetBSD__)
 #include <sys/endian.h>
 #define SDL_BYTEORDER  BYTE_ORDER
 #else