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Remove both unnecessary SRC_DEPS depenencies and -fglasgow-exts flags.

Instead of passing package dependencies via `SRC_HC_OPTS=-package ...`
we rather pass them via `SRC_DEPS`, allowing the build system to
know about the dependency.

Required due to an amendment that disallows as-patterns with leading
whitespace:

  f x@ pat = rhs  -- now disallowed

GHC Proposal #229 changes the lexical rules of Haskell, which may
require slight whitespace adjustments in certain cases.

This patch changes formatting in nofib in a way that enables it to
compile under the proposed rules.

it might have a different name

As reported in ghc#17196, GHC now prints "MiB" instead of
"MB" in its RTS reporting output.

Otherwise it isn't run by default.

This is what I wrote, using easy.sh is easy as

    ./easy.sh /code/ghc1/_build/stage1/bin/ghc /code/ghc2/_build/stage2/bin/ghc

or even

    ./easy.sh /code/ghc1 /code/ghc2