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/os_win32.c b/src/os_win32.c
index 52e0583..ff60e04 100644
--- a/src/os_win32.c
+++ b/src/os_win32.c
@@ -2721,6 +2721,8 @@
     {
 	char_u	*res = resolve_appexeclink((char_u *)name);
 	if (res == NULL)
+	    res = resolve_reparse_point((char_u *)name);
+	if (res == NULL)
 	    return FALSE;
 	// The path is already absolute.
 	if (path != NULL)