[Dovecot] patch for mysterious maildir symlink error

[Timo Sirainen]

On Thu, 2010-10-07 at 20:42 -0500, Mike Abbott wrote:
> This may resolve the mysterious "Maildir: Symlink destination doesn't exist" errors.
> 
> -	if (lstat(path, &st) == 0 && (st.st_mode & S_IFLNK) != 0) {
> +	if (lstat(path, &st) == 0 && (st.st_mode & S_IFMT) == S_IFLNK) {

Yeah, looks like I had always just been using the S_IS*() macros so I
didn't realize this had to be done. Wonder why I didn't use S_ISLNK()
though. Maybe there is still some OS that doesn't support it (I see it's
POSIX 2001).

Anyway, committed to 1.2 and 2.0.