SDL: Test: Add float header for FLT_RADIX definition.

SDL Commits
1 
From a864180cf35f0d7ad61b5fa6df26c67b539cf392 Mon Sep 17 00:00:00 2001
From: Pierre Wendling <[EMAIL REDACTED]>
Date: Sun, 15 May 2022 19:36:30 -0400
Subject: [PATCH] Test: Add float header for FLT_RADIX definition.

---
 test/testautomation_math.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/test/testautomation_math.c b/test/testautomation_math.c
index 14d0afdfe08..806534d7b32 100644
--- a/test/testautomation_math.c
+++ b/test/testautomation_math.c
@@ -3,6 +3,7 @@
  */
 
 #include <math.h>
+#include <float.h>
 
 #include "SDL.h"
 #include "SDL_test.h"