[GHC] #10795: Upgrade gcc in 7.10

[GHC]

#10795: Upgrade gcc in 7.10
-------------------------------------+-------------------------------------
              Reporter:  joozek78    |             Owner:
                  Type:  task        |            Status:  new
              Priority:  normal      |         Milestone:  7.10.3
             Component:  Build       |           Version:  7.10.2
  System                             |
              Keywords:              |  Operating System:  Windows
          Architecture:              |   Type of failure:  Compile-time
  Unknown/Multiple                   |  crash
             Test Case:              |        Blocked By:
              Blocking:              |   Related Tickets:
Differential Revisions:              |
-------------------------------------+-------------------------------------
 See #10777. The patch submitted by snoyberg won't work unless gcc is
 upgraded (at least to 4.7.0 I think - take a look at
 [[http://sourceforge.net/p/mingw-w64/mailman/message/29339395/|this mail
 thread]]). That's because response files are not used properly by older
 gcc.

 '''gcc was upgraded for 7.12 in #10726 so this just needs to be
 backported'''

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10795>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler