Cope better with non-ASCII encodings in spec files (plus change)

[nphilipp]

commit da1ee57b3f08548c47a0368c3c47fac5a5116487
Author: Nils Philippsen <nils@redhat.com>
Date:   Thu Feb 8 18:01:43 2024 +0100

    Ensure locale modifications stay isolated in tests
    
    Rename and refactor the setlocale() fixture for this and make it
    generally available.
    
    Signed-off-by: Nils Philippsen <nils@redhat.com>

commit 8cf6d66aec5aec7daa7f92e964fdbb2a3d3829ff (main--tests-break-encoding)
Author: Nils Philippsen <nils@redhat.com>
Date:   Thu Feb 8 18:05:37 2024 +0100

    Extract unpacking repo from test_process_distgit
    
    This makes the function a little less unwieldy.
    
    Signed-off-by: Nils Philippsen <nils@redhat.com>

commit 13384aeb2716cda21dc6e873d0ba3a68fc65b28f
Author: Nils Philippsen <nils@redhat.com>
Date:   Thu Feb 8 18:36:09 2024 +0100

    Test process_distgit.main() functionally
    
    Previously, this only checked if process_distgit.process_distgit() was
    called correctly. It’s easy enough to test that the whole operation
    works.
    
    Signed-off-by: Nils Philippsen <nils@redhat.com>

commit f99889d52b98050e2e0a3abac680ab9a2f7b25ef
Author: Nils Philippsen <nils@redhat.com>
Date:   Wed Feb 7 19:12:14 2024 +0100

    Cope better with non-ASCII encodings in spec files
    
    This broke with the change to use the rpm Python package to expand
    macros in-process. The reason was that the %lua_requires macro set the
    locale to "C" (_not_ "C.UTF-8") as a side effect which caused text files
    to be opened with "ascii" encoding from then on.
    
    Fixes: #64
    
    Signed-off-by: Nils Philippsen <nils@redhat.com>

Fixes: #64