package/libsvgtiny: add patch to fix GCC 15.x build issue

Add a small, easily backportable patch to fix GCC 15.x build
issue. The issue is also fixed upstream in later releases, but this
patch is a minimal fix that can be backported to LTS independently
from a version bump.

Fixes:

  https://autobuild.buildroot.org/results/c3d703663faabe40448d908afbdbb351a016aece/

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libsvgtiny/0005-src-svgtiny_gradient-svgtiny_list-.c-add-missing-std.patch

@@ -0,0 +1,42 @@
+From 1d86ce7e6ea9fae8285eed23d838f87ab3ac083c Mon Sep 17 00:00:00 2001
+From: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
+Date: Tue, 19 Aug 2025 23:28:35 +0200
+Subject: [PATCH] src/{svgtiny_gradient,svgtiny_list}.c: add missing <stdlib.h>
+
+Needed to get the prototype for malloc()/free().
+
+Upstream: N/A, already fixed upstream in a later release (but as part
+of a larger commit)
+Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
+---
+ src/svgtiny_gradient.c | 1 +
+ src/svgtiny_list.c     | 1 +
+ 2 files changed, 2 insertions(+)
+
+diff --git a/src/svgtiny_gradient.c b/src/svgtiny_gradient.c
+index 3a8db73..5172223 100644
+--- a/src/svgtiny_gradient.c
++++ b/src/svgtiny_gradient.c
+@@ -8,6 +8,7 @@
+ #include <assert.h>
+ #include <math.h>
+ #include <string.h>
++#include <stdlib.h>
+ #include "svgtiny.h"
+ #include "svgtiny_internal.h"
+ 
+diff --git a/src/svgtiny_list.c b/src/svgtiny_list.c
+index 53cfb34..91e2c98 100644
+--- a/src/svgtiny_list.c
++++ b/src/svgtiny_list.c
+@@ -11,6 +11,7 @@
+  */
+ 
+ #include <assert.h>
++#include <stdlib.h>
+ #include "svgtiny.h"
+ #include "svgtiny_internal.h"
+ 
+-- 
+2.50.1
+