patch 7.4.1399
Problem:    The MS-DOS code does not build.
Solution:   Remove the old MS-DOS code.
diff --git a/src/ex_getln.c b/src/ex_getln.c
index a0c9877..6741e11 100644
--- a/src/ex_getln.c
+++ b/src/ex_getln.c
@@ -4918,7 +4918,7 @@
 	if (*s == ' ')
 	    ++s;	/* Skip space used for absolute path name. */
 
-#if defined(MSDOS) || defined(MSWIN)
+#if defined(MSWIN)
 	e = vim_strchr(s, ';');
 #else
 	e = vim_strchr(s, ':');
@@ -5217,7 +5217,7 @@
 	copy_option_part(&path, buf, MAXPATHL, ",");
 	if (STRLEN(buf) + STRLEN(file) + 2 < MAXPATHL)
 	{
-# if defined(MSWIN) || defined(MSDOS)
+# if defined(MSWIN)
 	    /* Using the platform's path separator (\) makes vim incorrectly
 	     * treat it as an escape character, use '/' instead. */
 	    if (*buf != NUL && !after_pathsep(buf, buf + STRLEN(buf)))