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We set -O2 in NoFibHcOpts which is then applied to all benchmarks run.

Adding -O2 in individual benchmarks is therefore redundant.
It also leads to issues when testing performance flags via
EXTRA_HC_OPTS.
Individual Makefiles attach -O2 last. This means all
flags set by -O2 could not be disabled with -fno-<flag> as they
were reenabled by the later -O2 switch.

Test Plan: Using

Reviewers: bgamari, jmct, O26 nofib

Differential Revision: https://phabricator.haskell.org/D4829

Summary:
By following the naming conventions of the build system we can
simplify the `Makefile`s a bit.  This patch also avoids having to
explicitly pass the flags to `runstdtest` for `fasta`, `k-nucleotide`
and `reverse-complement`.  The only consquence of this is that it's a
requirement to run `make boot` before `make` for these benchmarks. But
that is already the case since `.depend` files are generated by with
`make boot`.

Finally, this also update the `.gitignore` with the new names of
the output/input files.
Signed-off-by: Michal Terepeta <michal.terepeta@gmail.com>

Test Plan: build & run

Reviewers: bgamari

Reviewed By: bgamari

Differential Revision: https://phabricator.haskell.org/D3412

Summary:
This allows nofib to run on Windows using `msys`.

Also deprecates the old `cygwin` stuff.

Test Plan: make clean && make

Reviewers: bgamari

Reviewed By: bgamari

Subscribers: RyanGlScott, #ghc_windows_task_force

Differential Revision: https://phabricator.haskell.org/D3030

John Wiegley tells me this causes a failure for nofib on his machine, so
to be safe we'll back it out for now.
Signed-off-by: Austin Seipp <aseipp@pobox.com>

Signed-off-by: Austin Seipp <aseipp@pobox.com>