More cleanups.

Added more languages.
Updated SCAT machines (for the Asian demo machines.)
Fixed VC project files.
Started integrating building of language DLL's into mainline.
Added the Award 8088 XT Clone machine.

src/win/win_lang.c

@@ -8,7 +8,7 @@
  *
  *		Handle language support for the platform.
  *
- * Version:	@(#)win_lang.c	1.0.3	2018/06/04
+ * Version:	@(#)win_lang.c	1.0.4	2018/06/09
  *
  * Author:	Fred N. van Kempen, <decwiz@yahoo.com>
  *
@@ -108,7 +108,7 @@ static void
 lang_add(lang_t *ptr, int sort)
 {
     lang_t *p, *pp;
-    lang_t *prev = 0;
+    lang_t *prev = NULL;
 
     /* Create a copy of the entry data. */
     pp = (lang_t *)malloc(sizeof(lang_t));