SDL: cpuinfo: Include unistd.h for getpagesize() support, too.

SDL Commits
1 
From 6ab212bd13a98d5d32265431da7bebc8a5ec1660 Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <[EMAIL REDACTED]>
Date: Fri, 10 Oct 2025 21:52:41 -0400
Subject: [PATCH] cpuinfo: Include unistd.h for getpagesize() support, too.

---
 src/cpuinfo/SDL_cpuinfo.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/cpuinfo/SDL_cpuinfo.c b/src/cpuinfo/SDL_cpuinfo.c
index a097170e118ea..b45326fd2ff7c 100644
--- a/src/cpuinfo/SDL_cpuinfo.c
+++ b/src/cpuinfo/SDL_cpuinfo.c
@@ -29,7 +29,7 @@
 
 // CPU feature detection for SDL
 
-#ifdef HAVE_SYSCONF
+#if defined(HAVE_SYSCONF) || defined(HAVE_GETPAGESIZE)
 #include <unistd.h>
 #endif
 #ifdef HAVE_SYSCTLBYNAME