Apply temporary patch to fix SEGV on KDE

.github/workflows/build.yml

@@ -81,6 +81,12 @@ jobs:
         with:
           path: 'SDL3-CS'
 
+      - name: Apply temporary patch
+        if: runner.os == 'Linux'
+        run: |
+          # Remove when https://github.com/libsdl-org/SDL/pull/9523 is merged.
+          git apply SDL3-CS/fix-segfault.patch
+
       - name: Configure CMake
         run:  ${{ matrix.platform.cmake_configure_env }} cmake -B build ${{ matrix.platform.flags }} -DCMAKE_BUILD_TYPE=$BUILD_TYPE -DSDL_SHARED_ENABLED_BY_DEFAULT=ON -DSDL_STATIC_ENABLED_BY_DEFAULT=ON
 

fix-segfault.patch

@@ -0,0 +1,41 @@
+From b90577b2af4e7e2b2d74169bbc36d646e6e5c387 Mon Sep 17 00:00:00 2001
+From: Dan Balasescu <smoogipoo@smgi.me>
+Date: Sat, 13 Apr 2024 01:56:52 +0900
+Subject: [PATCH] Fix segmentation fault on Wayland 1.18 + KDE
+
+The CI build matrix uses Ubuntu 20.04 as one of its configurations.
+This platform only comes with Wayland 1.18, but the display output
+name is only available since Wayland 1.20 (output version 4).
+
+This was considered in other areas, for example the main function that
+reads this value mentions version 4 specifically:
+
+https://github.com/libsdl-org/SDL/blob/60f26182c3a44544f78c1569906fdf58d1d69374/src/video/wayland/SDL_waylandvideo.c#L915
+
+... and the different versions are selected when adding displays:
+
+https://github.com/libsdl-org/SDL/blob/60f26182c3a44544f78c1569906fdf58d1d69374/src/video/wayland/SDL_waylandvideo.c#L85-L89
+
+We are also providing binaries of our own compiled on Ubuntu 20.04
+(still generally supported until 2025-06) specifically to target a
+lower GLIBC version.
+---
+ src/video/wayland/SDL_waylandvideo.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/video/wayland/SDL_waylandvideo.c b/src/video/wayland/SDL_waylandvideo.c
+index 105ed67d9..5c7344b15 100644
+--- a/src/video/wayland/SDL_waylandvideo.c
++++ b/src/video/wayland/SDL_waylandvideo.c
+@@ -248,7 +248,7 @@ static void Wayland_SortOutputs(SDL_VideoData *vid)
+     /* KDE provides the kde-output-order-v1 protocol, which gives us the full preferred display
+      * ordering in the form of a list of wl_output.name strings (connector names).
+      */
+-    if (!WAYLAND_wl_list_empty(&vid->output_order)) {
++    if (!WAYLAND_wl_list_empty(&vid->output_order) && SDL_WL_OUTPUT_VERSION >= WL_OUTPUT_NAME_SINCE_VERSION) {
+         struct wl_list sorted_list;
+         SDL_WaylandConnectorName *c;
+ 
+-- 
+2.44.0
+