Externals: Update SDL to 2.30.9

Flatpak/SDL2/SDL2.json

@@ -0,0 +1,21 @@
+{
+  "name": "SDL2",
+  "buildsystem": "autotools",
+  "config-opts": ["--disable-static"],
+  "sources": [
+    {
+      "type": "dir",
+      "path": "../../Externals/SDL/SDL"
+    }
+  ],
+  "cleanup": [ "/bin/sdl2-config",
+               "/include",
+               "/lib/libSDL2.la",
+               "/lib/libSDL2main.a",
+               "/lib/libSDL2main.la",
+               "/lib/libSDL2_test.a",
+               "/lib/libSDL2_test.la",
+               "/lib/cmake",
+               "/share/aclocal",
+               "/lib/pkgconfig"]
+}

Flatpak/org.DolphinEmu.dolphin-emu.yml

@@ -47,6 +47,9 @@ modules:
         url: https://github.com/Unrud/xdg-screensaver-shim/archive/0.0.2.tar.gz
         sha256: 0ed2a69fe6ee6cbffd2fe16f85116db737f17fb1e79bfb812d893cf15c728399
 
+  # build the vendored SDL2 from Externals until the runtime gets 2.30.9
+  - SDL2/SDL2.json
+
   - name: dolphin-emu
     buildsystem: cmake-ninja
     config-opts: