patch 9.0.1769: executable() ignoring symlinks on Windows

Problem:  executable() ignoring symlinks on Windows
Solution: resolve reparse points

closes: #12562

Signed-off-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: AmberArr <me@frost.moe>
diff --git a/src/proto/os_mswin.pro b/src/proto/os_mswin.pro
index c63129f..d9172ee 100644
--- a/src/proto/os_mswin.pro
+++ b/src/proto/os_mswin.pro
@@ -37,6 +37,7 @@
 void mch_print_set_font(int iBold, int iItalic, int iUnderline);
 void mch_print_set_bg(long_u bgcol);
 void mch_print_set_fg(long_u fgcol);
+char_u *resolve_reparse_point(char_u *fname);
 char_u *mch_resolve_path(char_u *fname, int reparse_point);
 void win32_set_foreground(void);
 void serverInitMessaging(void);