[Mutt] #2975: [PATCH] Allow attachment saving on the FreeBSD's msdosfs

[Mutt <fleas@xxxxxxxx>]

#2975: [PATCH] Allow attachment saving on the FreeBSD's msdosfs

 While trying to save attachments to the flash mounted as the msdosfs
 within the FreeBSD box, I noticed that mutt is not able to do this.  The
 reason is that the 'link' syscall is not supported on this filesystem.

 I had added the check for the relevant errno value to the safe_rename
 function.  Works for me at FreeBSD RELENG_7.

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Ticket URL: <http://dev.mutt.org/trac/ticket/2975>