[newlib-cygwin] syscalls.cc: Use EISDIR

[Corinna Vinschen]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=cbeb1009a9faa966821190a4a83d4a120aefd753

commit cbeb1009a9faa966821190a4a83d4a120aefd753
Author: Ben Wijen <ben@wijen.net>
Date:   Fri Jan 15 14:45:27 2021 +0100

    syscalls.cc: Use EISDIR
    
    This is the non-POSIX value returned by Linux since 2.1.132.

Diff:
---
 winsup/cygwin/syscalls.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/winsup/cygwin/syscalls.cc b/winsup/cygwin/syscalls.cc
index 3030f6fff..4742c6653 100644
--- a/winsup/cygwin/syscalls.cc
+++ b/winsup/cygwin/syscalls.cc
@@ -1106,7 +1106,7 @@ unlink (const char *ourname)
   else if (win32_name.isdir ())
     {
       debug_printf ("unlinking a directory");
-      set_errno (EPERM);
+      set_errno (EISDIR);
       goto done;
     }