SDL_image: aom: use $<AND> CMake generator expression

SDL Commits
1 
From 6ff912c8fc2df55690cc1ff511021f5c335c4015 Mon Sep 17 00:00:00 2001
From: Anonymous Maarten <[EMAIL REDACTED]>
Date: Wed, 17 Dec 2025 17:11:57 +0100
Subject: [PATCH] aom: use $<AND> CMake generator expression

---
 external/aom | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/external/aom b/external/aom
index 8598966b..2f15557f 160000
--- a/external/aom
+++ b/external/aom
@@ -1 +1 @@
-Subproject commit 8598966b6b6fc1fd2294ce0a677d02f50b03fad5
+Subproject commit 2f15557f5b3f6957a8a40cf89c4fb5d0e15bfd7a