Add a vendored copy of SDL

vendored/sdl/test/README

@@ -0,0 +1,50 @@
+
+These are test programs for the SDL library:
+
+	checkkeys	Watch the key events to check the keyboard
+	loopwave	Audio test -- loop playing a WAV file
+	loopwavequeue	Audio test -- loop playing a WAV file with SDL_QueueAudio
+	testsurround	Audio test -- play test tone on each audio channel
+	testaudioinfo	Lists audio device capabilities
+	testerror	Tests multi-threaded error handling
+	testfile	Tests RWops layer
+	testgl2		A very simple example of using OpenGL with SDL
+	testiconv	Tests international string conversion
+	testjoystick	List joysticks and watch joystick events
+	testkeys	List the available keyboard keys
+	testloadso	Tests the loadable library layer
+	testlocale  Test Locale API
+	testlock	Hacked up test of multi-threading and locking
+	testmouse	Tests mouse coordinates
+	testmultiaudio	Tests using several audio devices
+	testoverlay2	Tests the overlay flickering/scaling during playback.
+	testplatform	Tests types, endianness and cpu capabilities
+	testsem		Tests SDL's semaphore implementation
+	testshape	Tests shaped windows
+	testsprite2	Example of fast sprite movement on the screen
+	testthread	Hacked up test of multi-threading
+	testtimer	Test the timer facilities
+	testver		Check the version and dynamic loading and endianness
+	testwm2		Test window manager -- title, icon, events
+	torturethread	Simple test for thread creation/destruction
+	controllermap   Useful to generate Game Controller API compatible maps
+
+
+
+This directory contains sample.wav, which is a sample from Will Provost's
+song, The Living Proof:
+
+     From the album The Living Proof
+     Publisher: 5 Guys Named Will
+     Copyright 1996 Will Provost
+
+You can get a copy of the full song (and album!) from iTunes...
+
+    https://itunes.apple.com/us/album/the-living-proof/id4153978
+
+or Amazon...
+
+    http://www.amazon.com/The-Living-Proof-Will-Provost/dp/B00004R8RH
+
+Thanks to Will for permitting us to distribute this sample with SDL!
+