[commit: ghc] wip/T8545-ghc-7.8's head updated: Convert all sub-repos into proper submodules (re #8545) (ed9b7ea)

[git at git.haskell.org]

Repository : ssh://git@git.haskell.org/ghc

Branch 'wip/T8545-ghc-7.8' now includes:

     9055d6b Add test case for #8917
     3dbbe12 Fix #8917.
     e7563ec change deriveConstants to use nm in a POSIX way (fixes #8781)
     05e160e add --with-ar and --with-ranlib configure parameters
     28923eb Switch to relative URLs in .gitmodules
     ed9b7ea Convert all sub-repos into proper submodules (re #8545)