SDL_image: update vendored libaom for nasm v3.0x (6affc)

From 6affc015bca5d67bcb931a59f55362be2d25eae3 Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Mon, 13 Oct 2025 08:23:02 +0300
Subject: [PATCH] update vendored libaom for nasm v3.0x

(cherry picked from commit d847d6b146edeccb0c444a8e049b88b1dbac7632)
---
 external/aom | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/external/aom b/external/aom
index d7cc949b..f6aad864 160000
--- a/external/aom
+++ b/external/aom
@@ -1 +1 @@
-Subproject commit d7cc949b05daec50bcde50a6e3c763c58158668d
+Subproject commit f6aad864b415a9a5b810291520c1f50e3ecf1253