migrated code to pragma-like ROM layout definitions

c64/basic/pack_word.s

@@ -1,4 +1,6 @@
-#if ROM_LAYOUT_STD || (ROM_LAYOUT_M65 && SEGMENT_BASIC_0)
+// #LAYOUT# STD *       #TAKE
+// #LAYOUT# *   BASIC_0 #TAKE
+// #LAYOUT# *   *       #IGNORE
 
 // Pack a word using the simple compression scheme.
 // This has to be the same implementation as in compress_text.c
@@ -255,6 +257,3 @@ not_a_match:
 	// Not a char that we can pack, so return 0
 	lda #$00
 	rts
-
-
-#endif // ROM layout