[GHC] #11223: Dynamic linker on Windows is unable to link against libmingwex

[GHC]

#11223: Dynamic linker on Windows is unable to link against libmingwex
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        Reporter:  Phyx-             |                Owner:  Phyx-
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Runtime System    |              Version:  7.10.3
  (Linker)                           |
      Resolution:                    |             Keywords:
Operating System:  Windows           |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash                              |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #10726            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Phyx-):

 Loading the symbols earlier seems like it will work. The issue now is that
 a horrible design decision with `libmingwex` is causing us to have to link
 in far more than expected.
 [http://sourceforge.net/p/mingw-w64/mailman/mingw-w64-public/thread/4FDD7839.7080803@gmail.com/
 libmingwex] has a depencency on the symbol `__mingw_raise_matherr`. This
 symbol is defined in `libmingw32` which is where the fun begins..

 We also end up needing the `ld` symbol `__image_base__` because of these
 dependencies and ultimately `libmingw32` also requires `wWinMain` which is
 the only symbol I don't know what to do about.

 The list of needed libraries:
 * libgcc.a
 * libws2_32.a
 * libmingw32.a
 * user32.dll
 * Advapi32.dll

 I'll keep looking, but we may want to consider re-distributing
 `msvcrt120.dll` which would also have all the symbols we need. It seems
 like the license for `Visual Studio 2013 C++ Redistributables` might
 [https://msdn.microsoft.com/en-us/vstudio/dn501987 allow] this now.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11223#comment:3>
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