Use system runtime linker in GHCi on PowerPC 64 bit

Teach GHCi to use the system runtime linker to load Haskell libraries on powerpc64.

See the following test failures.

ghcilink004:

ghc-stage2: dir004/libfoo.a: unknown architecture (e_machine == 21)
ghc-stage2: panic! (the 'impossible' happened)
  (GHC version 7.11.20151219 for powerpc64-unknown-linux):
        loadArchive "dir004/libfoo.a": failed
CallStack (from ImplicitParams):
  error, called at libraries/ghci/GHCi/ObjLink.hs:91:21 in ghci-0.0:GHCi.ObjLink

Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

prog001:

ghc-iserv.bin: /home/peter/ghc/libraries/ghc-prim/dist-install/build/libHSghc-prim-0.5.0.0.a: unknown architecture (e_machine == 21)
ghc-iserv.bin: loadArchive "/home/peter/ghc/libraries/ghc-prim/dist-install/build/libHSghc-prim-0.5.0.0.a": failed
CallStack (from ImplicitParams):
  error, called at libraries/ghci/GHCi/ObjLink.hs:91:21 in ghci-0.0:GHCi.ObjLink
ghc-stage2: ghc-iserv terminated (1)

Using the system runtime linker fixes 13 failing tests.

Trac metadata

Trac field	Value
Version	7.11
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	GHCi
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