[GHC] #12910: Mirror mingw signature files

[GHC]

#12910: Mirror mingw signature files
----------------------------------------+---------------------------------
           Reporter:  bgamari           |             Owner:  bgamari
               Type:  task              |            Status:  new
           Priority:  high              |         Milestone:  8.2.1
          Component:  None              |           Version:  8.0.1
           Keywords:                    |  Operating System:  POSIX
       Architecture:  Unknown/Multiple  |   Type of failure:  None/Unknown
          Test Case:                    |        Blocked By:
           Blocking:                    |   Related Tickets:
Differential Rev(s):                    |         Wiki Page:
----------------------------------------+---------------------------------
 We should really provide signatures alongside the mingw binaries and
 sources on `ghc.haskell.org`.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12910>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler