SDL: Allow building on really old Linux kernels (thanks @sezero!)

SDL Commits
1 
From 0b28cbe385c808b3cbe89b8eb7c2b10d7849599b Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Tue, 30 May 2023 16:36:13 -0700
Subject: [PATCH] Allow building on really old Linux kernels (thanks @sezero!)

---
 src/hidapi/SDL_hidapi_linux.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/hidapi/SDL_hidapi_linux.h b/src/hidapi/SDL_hidapi_linux.h
index f06627608092..7face2418a6f 100644
--- a/src/hidapi/SDL_hidapi_linux.h
+++ b/src/hidapi/SDL_hidapi_linux.h
@@ -40,6 +40,7 @@ static const SDL_UDEV_Symbols *udev_ctx = NULL;
 #define udev_unref                                    udev_ctx->udev_unref
 
 #undef HIDAPI_H__
+#define HIDAPI_ALLOW_BUILD_WORKAROUND_KERNEL_2_6_39
 #include "linux/hid.c"
 #define HAVE_PLATFORM_BACKEND 1