SDL: testevdev: Fix detection of word size (e07f1)

From e07f1067606bacba159ea089ddb6767ce85955ef Mon Sep 17 00:00:00 2001
From: Helge Deller <[EMAIL REDACTED]>
Date: Sun, 9 Oct 2022 12:13:23 +0200
Subject: [PATCH] testevdev: Fix detection of word size

The check for whether to use a 32- or 64-bit swap for an array of long
values always took the 64-bit path, because <limits.h> wasn't included
and therefore ULONG_MAX wasn't defined. Turn this into a runtime check,
which a reasonable compiler will optimize into a constant.

This fixes testevdev failures on 32-bit big-endian platforms such as hppa
and older powerpc. Little-endian and/or 64-bit platforms are unaffected.

[smcv: Added commit message]
Bug-Debian: https://bugs.debian.org/1021310
Co-authored-by: Simon McVittie <smcv@collabora.com>

(cherry-picked from commit fb32effd15a52097de985558a14e3851681d0ae1)
---
 test/testevdev.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/test/testevdev.c b/test/testevdev.c
index 938a9a504615..fe9e367eead7 100644
--- a/test/testevdev.c
+++ b/test/testevdev.c
@@ -935,12 +935,8 @@ static const GuessTest guess_tests[] =
     }
 };
 
-#if ULONG_MAX == 0xFFFFFFFFUL
-#   define SwapLongLE(X) SDL_SwapLE32(X)
-#else
-    /* assume 64-bit */
-#   define SwapLongLE(X) SDL_SwapLE64(X)
-#endif
+#define SwapLongLE(X) \
+	((sizeof(unsigned long) == 4) ? SDL_SwapLE32(X) : SDL_SwapLE64(X))
 
 static int
 run_test(void)