Previously I would get an error during `make boot`:

    EffBench.hs:10:18: error:
        Could not load module ‘Control.Monad.State.Strict’
        It is a member of the hidden package ‘mtl-2.2.2’.
        You can run ‘:set -package mtl’ to expose it.
        (Note: this unloads all the modules in the current scope.)
        Use -v (or `:set -v` in ghci) to see a list of the files searched for.
       |
    10 | import qualified Control.Monad.State.Strict as S
       |

Since morally these flags are for the program and not runtest

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