patch 7.4.921
Problem: Missing proto file update. (Randall W. Morris)
Solution: Add the missing line for mch_ishidden.
diff --git a/src/proto/os_win32.pro b/src/proto/os_win32.pro
index cbabe3a..1431f69 100644
--- a/src/proto/os_win32.pro
+++ b/src/proto/os_win32.pro
@@ -19,6 +19,7 @@
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));