We are using floops in nas-ft, so it makes sense to use it everywhere

We remove the automatic alignment that fortran does to make the output
more similar to the one from the C / C++ programs.

This function is GNU specific, but it returns floating points directly.
By using it, we don't have to copy or proxy RAND_MAX to the non-C code.

We don't care about compiler options, and some of these parameters are
not portable anyways.

We only want to validate that two programs produce the same output.
Printing the checksums to stdout is sufficient for that.

We are only interested in the runtime of the entire program and that
can be measured more easily.

Using class C parameters for now

Arrays in Julia are column-major, so by iterating through them row by
row the program is constantly refilling the cache and leaves a lot of
performance on the table.

The results are mostly identical with the output from the C reference,
but there are some floating point errors that prevent the hashes from
matching.

This option is
 - redundant, the OpenMP threads can be set with an environment variable
 - not portable to other threading frameworks (e.g. Julia)
 - not necessary, because we want all threads to be used