Dont allow clients that do not support BASE

Signed-off-by: Jan Vidar Krey <janvidar@extatic.org>

src/user.c

@@ -121,6 +121,9 @@ static int convert_support_fourcc(int fourcc)
 	switch (fourcc)
 	{
 		case FOURCC('B','A','S','0'): /* Obsolete */
+#ifndef OLD_ADC_SUPPORT
+			return 0;
+#endif
 		case FOURCC('B','A','S','E'):
 			return feature_base;