Attempt to expand macros before processing conditions

[nforro]

Fixes #391.

RELEASE NOTES BEGIN

specfile now tries to expand macros before processing conditions to be able to resolve conditional expressions defined by macros, for example OpenSUSE Tumbleweed defines %ifpython3 macro as %if "%{python_flavor}" == "python3".

RELEASE NOTES END

[packit-as-a-service]

We were not able to find or create Copr project packit/packit-specfile-394 specified in the config with the following error:

Cannot create a new Copr project (owner=packit project=packit-specfile-394 chroots=['epel-8-x86_64']): Response is not in JSON format, there is probably a bug in the API code.

---

Please check your configuration for:

1. typos in owner and project name (groups need to be prefixed with @)
2. whether the project name doesn't contain not allowed characters (only letters, digits, underscores, dashes and dots must be used)
3. whether the project itself exists (Packit creates projects only in its own namespace)
4. whether Packit is allowed to build in your Copr project
5. whether your Copr project/group is not private

[softwarefactory-project-zuul]

Build succeeded.
https://softwarefactory-project.io/zuul/t/packit-service/buildset/f25a10560b244f74aa1b4013e358a199

✔️ pre-commit SUCCESS in 2m 16s
✔️ specfile-tests-rpm-deps SUCCESS in 1m 10s
✔️ specfile-tests-pip-deps SUCCESS in 1m 07s

[nforro]

/packit rebuild-failed

[softwarefactory-project-zuul]

Build succeeded (gate pipeline).
https://softwarefactory-project.io/zuul/t/packit-service/buildset/74f7cf3af4ec489d8c928f65609406de

✔️ pre-commit SUCCESS in 2m 10s