Fixed subject line: "absent linear" should be "absent linear step" in the subject line;
i.e. with "step" added: "Fortran: OpenMP fix declare simd inside modules and absent linear step [PR106566]"

I have also decided to move the 'step = 1' to openmp.cc, which also set it before with
the old pre-OpenMP 5.2 syntax.

I also added a pre-OpenMP-5.2-syntax example.

  * * *

For GCC 12 (and GCC 11), only the '%s' fix and the third, now added example apply;
for the 5.1 syntax, 'step' was already set.

OK? And thoughts regarding the backports (none? Only 12? Or 11+12?)?

Tobias
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