patch 7.4.921

Problem:    Missing proto file update. (Randall W. Morris)
Solution:   Add the missing line for mch_ishidden.

Author: brammool

src/proto/os_win32.pro

@@ -19,6 +19,7 @@ int mch_dirname __ARGS((char_u *buf, int len));
 long mch_getperm __ARGS((char_u *name));
 int mch_setperm __ARGS((char_u *name, long perm));
 void mch_hide __ARGS((char_u *name));
+int mch_ishidden __ARGS((char_u *name));
 int mch_isdir __ARGS((char_u *name));
 int mch_mkdir __ARGS((char_u *name));
 int mch_is_hard_link __ARGS((char_u *fname));

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    921,
 /**/
     920,
 /**/