patch 7.4.1008
Problem:    The OS/2 code pollutes the source while nobody uses it these days.
Solution:   Drop the support for OS/2.
diff --git a/src/ex_getln.c b/src/ex_getln.c
index b6aeacf..3919466 100644
--- a/src/ex_getln.c
+++ b/src/ex_getln.c
@@ -4955,7 +4955,7 @@
 	if (*s == ' ')
 	    ++s;	/* Skip space used for absolute path name. */
 
-#if defined(MSDOS) || defined(MSWIN) || defined(OS2)
+#if defined(MSDOS) || defined(MSWIN)
 	e = vim_strchr(s, ';');
 #else
 	e = vim_strchr(s, ':');