Vendor raptor source files (was embedded gitlink)

Tree vendored at upstream 0019c5dd; origin + license recorded in
raptor/VENDOR.txt. Windows SDL dev packages excluded via .gitignore.

raptor/include/SDL2-devel-2.28.2-mingw/SDL2-2.28.2/test/emscripten/joystick-pre.js

@@ -0,0 +1,25 @@
+Module['arguments'] = ['0'];
+//Gamepads don't appear until a button is pressed and the joystick/gamepad tests expect one to be connected
+Module['preRun'].push(function()
+{
+    Module['print']("Waiting for gamepad...");
+    Module['addRunDependency']("gamepad");
+    window.addEventListener('gamepadconnected', function()
+    {
+        //OK, got one
+        Module['removeRunDependency']("gamepad");
+    }, false);
+
+    //chrome
+    if(!!navigator.webkitGetGamepads)
+    {
+        var timeout = function()
+        {
+            if(navigator.webkitGetGamepads()[0] !== undefined)
+                Module['removeRunDependency']("gamepad");
+            else
+                setTimeout(timeout, 100);
+        }
+        setTimeout(timeout, 100);
+    }
+});