Fixed outdated information in README for test programs.

Two programs were removed some time ago and one was renamed.

test/README

@@ -5,11 +5,9 @@ These are test programs for the SDL library:
 	loopwave	Audio test -- loop playing a WAV file
 	loopwavequeue	Audio test -- loop playing a WAV file with SDL_QueueAudio
 	testaudioinfo	Lists audio device capabilities
-	testcdrom	Sample audio CD control program
 	testerror	Tests multi-threaded error handling
 	testfile	Tests RWops layer
 	testgl2		A very simple example of using OpenGL with SDL
-	testhread	Hacked up test of multi-threading
 	testiconv	Tests international string conversion
 	testjoystick	List joysticks and watch joystick events
 	testkeys	List the available keyboard keys
@@ -17,11 +15,11 @@ These are test programs for the SDL library:
 	testlock	Hacked up test of multi-threading and locking
 	testmultiaudio	Tests using several audio devices
 	testoverlay2	Tests the overlay flickering/scaling during playback.
-	testpalette	Tests palette color cycling
 	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