Cyclic dependency prevents installation of python39 (also python3)

Hi Marco,

Please find more details about the issue:

Host:
- Windows_NT Windows 11 (24H2) [Server 2025] amd64 AMD64 Family 23 Model 1 Stepping 2 MS/Windows
- setup-x86_64.exe v 2.934


Default command: nothing is installed
```
> setup-x86_64.exe --arch x86_64 --root C:/cygwin64 --symlink-type native --quiet-mode --no-desktop --packages clang

solving: 1 tasks, update: no, use test packages: no
solving: 0 tasks, update: no, use test packages: no
Augmented Transaction List: is empty
```

Verbose command: 'Conflict.level1' are detected with ANALYZE UNSOLVABLE
```
> setup-x86_64.exe --arch x86_64 --root C:/cygwin64 --symlink-type native --quiet-mode --no-desktop --verbose --packages clang

Added manual package clang
solving: 1 tasks, update: no, use test packages: no
libsolv: solver started
libsolv: dosplitprovides=0, noupdateprovide=0, noinfarchcheck=0
libsolv: allowuninstall=0, allowdowngrade=0, allownamechange=1, allowarchchange=0, allowvendorchange=1
libsolv: dupallowdowngrade=1, dupallownamechange=1, dupallowarchchange=1, dupallowvendorchange=1
libsolv: promoteepoch=0, forbidselfconflicts=0
libsolv: obsoleteusesprovides=0, implicitobsoleteusesprovides=0, obsoleteusescolors=0, implicitobsoleteusescolors=0
libsolv: dontinstallrecommended=0, addalreadyrecommended=0 onlynamespacerecommended=0
libsolv: number of solvables: 828, memory used: 45 K
libsolv: number of ids: 1270 + 617
libsolv: string memory used: 4 K array + 14 K data,  rel memory used: 7 K array
libsolv: string hash memory: 32 K, rel hash memory : 16 K
libsolv: provide ids: 622
libsolv: provide space needed: 1554 + 1234
libsolv: shrunk whatprovidesdata from 1554 to 1390
libsolv: shrunk whatprovidesauxdata from 1554 to 929
libsolv: whatprovides memory used: 11 K id array, 10 K data
libsolv: whatprovidesaux memory used: 4 K id array, 3 K data
libsolv: WARNING: pool_addfileprovides was not called, this may result in slow operation
libsolv: lazywhatprovidesq size: 0 entries
libsolv: createwhatprovides took 0 ms
libsolv: obsoletes data: 1 entries
libsolv: added 1689 pkg rules for installed solvables
libsolv: added 278 pkg rules for updaters of installed solvables
libsolv: added 12 pkg rules for packages involved in a job
libsolv: added 0 pkg rules because of weak dependencies
libsolv: 483 of 827 installable solvables considered for solving
libsolv: pruned rules from 1980 to 1980
libsolv:   binary: 320
libsolv:   normal: 1659, 3384 literals
libsolv: pkg rule memory used: 46 K
libsolv: pkg rule creation took 0 ms
libsolv: choice rule creation took 0 ms
libsolv: 1979 pkg rules, 2 * 221 update rules, 1 job rules, 0 infarch rules, 0 dup rules, 0 choice rules, 0 best rules, 0 yumobs rules
libsolv: 0 black rules, 0 recommends rules, 0 repo priority rules
libsolv: overall rule memory used: 56 K
libsolv: solving...
libsolv: ANALYZE UNSOLVABLE ----------------------
libsolv: Rule #1192:
libsolv:
libsolv:     !python39-3.9.16-1.any [521]
libsolv:  (w1)
libsolv:  Install.level1
libsolv:
libsolv:     python39-pip-25.2-2.any [535]
libsolv:  (w2)
libsolv:  Conflict.level1
libsolv:
libsolv:     next rules: 1193 0
libsolv: Rule #1195:
libsolv:
libsolv:     !python3-3.9.16-1.any [519]
libsolv:  (w1)
libsolv:  Install.level1
libsolv:
libsolv:     python39-3.9.16-1.any [521]
libsolv:  (w2)
libsolv:  Install.level1
libsolv:
libsolv:     next rules: 0 0
libsolv: Rule #1159:
libsolv:
libsolv:     !python39-pip-25.2-2.any [535]
libsolv:  (w1)
libsolv:  Conflict.level1
libsolv:
libsolv:     python39-sphinx-4.4.0-1.any [543]
libsolv:  (w2)
libsolv:  Conflict.level1
libsolv:
libsolv:     next rules: 0 0
libsolv: Rule #1858:
libsolv:
libsolv:     !clang-20.1.8-2.any [43]
libsolv:  (w1)
libsolv:  Install.level1
libsolv:
libsolv:     python3-3.9.16-1.any [519]
libsolv:  (w2)
libsolv:  Install.level1
libsolv:
libsolv:     next rules: 0 0
libsolv: Rule #1124:
libsolv:
libsolv:     !python39-sphinx-4.4.0-1.any [543]
libsolv:  (w1)
libsolv:  Conflict.level1
libsolv:
libsolv:     python39-pygments-2.10.0-1.any [538]
libsolv:  (w2)
libsolv:  Conflict.level1
libsolv:
libsolv:     next rules: 1125 1170
libsolv: JOB
libsolv: Rule #2422:
libsolv:
libsolv:     clang-20.1.8-2.any [43]
libsolv:  (w1)
libsolv:  Install.level1
libsolv:
libsolv:     next rules: 0 0
libsolv: Rule #1149:
libsolv:
libsolv:     !python39-pygments-2.10.0-1.any [538]
libsolv:  (w1)
libsolv:  Conflict.level1
libsolv:
libsolv:     next rules: 0 0
libsolv: resolving job rules
libsolv: resolving installed packages
libsolv: deciding orphaned packages
libsolv: solver statistics: 0 learned rules, 1 unsolvable, 0 minimization steps
libsolv: done solving.

libsolv: solver took 16 ms
libsolv: final solver statistics: 1 problems, 0 learned rules, 1 unsolvable
libsolv: solver_solve took 16 ms

...

libsolv:
libsolv: ordering transaction
libsolv: transaction elements: 0
Augmented Transaction List: is empty
```

Now, if I remove "python39-pip, python39-setuptools" from depends2 in setup.ini file: clang is installed with its dependencies
```
> setup-x86_64.exe --arch x86_64 --root C:/cygwin64 --symlink-type native --quiet-mode --no-desktop --packages clang

solving: 1 tasks, update: no, use test packages: no
solving: 3 tasks, update: no, use test packages: no
Augmented Transaction List:
   0 install python39 3.9.16-1
   1 install python3  3.9.16-1
   2 install clang    20.1.8-2
```

Best Regards
Ronan

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