Fix build issues

[ludopulles]

The migration to the meson build system, causes failures when building packages that depend on cysignals but don't use meson (i.e. they use setup.py).

Closes: #212

[tobiasdiez]

Thanks!

Changes lgtm. +1 for merging if the tests pass

[tobiasdiez]

@fchapoton @dimpase could you please have a look and merge this (and perhaps directly cut a new release).

I'm very sorry for having introduced this bug during the meson migration.

[dimpase]

I don't understand why this PR touches meson.build files. IMHO removing

add_project_arguments(
  '-X preliminary_late_includes_cy28=True',
  language: 'cython',

there might create meson build problems.
This is because meson builds don't understand these #... directives in Cython files, right, @tobiasdiez ?

[dimpase]

OK, good then

[ludopulles]

Thanks for merging this 😄.
Is there also a new release planned in the near future?

[dimpase]

hopefully later today

[user202729]

@dimpase I see you published the new release on GitHub, but you didn't update version number in pyproject.toml? (might break pypi)

[dimpase]

oops. OK, I'll do another one, also including one more just merged PR, by you.

Build systems ought to get the version from the git tag...