SDL_image: Added libjxl external dependency

From 6c5bc5cdbb94ebefbc92f3f657327ad78a09399d Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Sun, 8 May 2022 16:38:32 -0700
Subject: [PATCH] Added libjxl external dependency

---
 external/libjxl | 1 +
 1 file changed, 1 insertion(+)
 create mode 160000 external/libjxl

diff --git a/external/libjxl b/external/libjxl
new file mode 160000
index 0000000..a205468
--- /dev/null
+++ b/external/libjxl
@@ -0,0 +1 @@
+Subproject commit a205468bc5d3a353fb15dae2398a101dff52f2d3