patch 7.4.1399
Problem:    The MS-DOS code does not build.
Solution:   Remove the old MS-DOS code.
diff --git a/src/globals.h b/src/globals.h
index b43f1a2..6fd86fb 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -19,7 +19,7 @@
  */
 EXTERN long	Rows			/* nr of rows in the screen */
 #ifdef DO_INIT
-# if defined(MSDOS) || defined(WIN3264)
+# if defined(WIN3264)
 			    = 25L
 # else
 			    = 24L
@@ -948,9 +948,6 @@
 #endif
 
 EXTERN int	no_abbr INIT(= TRUE);	/* TRUE when no abbreviations loaded */
-#ifdef MSDOS
-EXTERN int	beep_count INIT(= 0);	/* nr of beeps since last char typed */
-#endif
 
 #ifdef USE_EXE_NAME
 EXTERN char_u	*exe_name;		/* the name of the executable */