initial support for Mega65 extra ROM

c64/basic/basic_delete_line.s

@@ -1,3 +1,5 @@
+#if ROM_LAYOUT_STD || (ROM_LAYOUT_M65 && SEGMENT_BASIC_0)
+
 // Delete the current BASIC line, which is assumed to have already
 // been found with basic_find_line.
 // Really only consists of copying memory down.
@@ -80,3 +82,6 @@ basic_delete_line:
 
 	clc
 	rts
+
+
+#endif // ROM layout