SDL: Remove testing instruction (see bug #5283)

From 220a9596f396248bf012131670a06f09411a7392 Mon Sep 17 00:00:00 2001
From: Sylvain <[EMAIL REDACTED]>
Date: Wed, 2 Feb 2022 10:01:11 +0100
Subject: [PATCH] Remove testing instruction (see bug #5283)

---
 src/thread/pthread/SDL_systhread.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/src/thread/pthread/SDL_systhread.c b/src/thread/pthread/SDL_systhread.c
index fb68b24ec04..b89256544e1 100644
--- a/src/thread/pthread/SDL_systhread.c
+++ b/src/thread/pthread/SDL_systhread.c
@@ -41,8 +41,6 @@
 #include "../../core/linux/SDL_dbus.h"
 #endif /* __LINUX__ */
 
-#undef HAVE_DLOPEN
-
 #if (defined(__LINUX__) || defined(__MACOSX__) || defined(__IPHONEOS__)) && defined(HAVE_DLOPEN)
 #include <dlfcn.h>
 #ifndef RTLD_DEFAULT