fix SDL

tier0/dbg.cpp

@@ -380,7 +380,7 @@ static SpewRetval_t _SpewMessage( SpewType_t spewType, const char *pGroupName, i
 
 	/* direct it to the appropriate target(s) */
 	SpewRetval_t ret;
-	assert( g_pSpewInfo == NULL );
+	assert( g_pSpewInfo == (void*)NULL );
 	SpewInfo_t spewInfo =
 	{
 		pColor,

wscript

@@ -155,6 +155,7 @@ def define_platform(conf):
 		conf.env.append_unique('DEFINES', ['TOGLES'])
 
 	if conf.options.SDL:
+		conf.env.SDL = 1
 		conf.define('USE_SDL', 1)
 
 	if conf.options.ALLOW64: