bdist_rpm: drop rpm2_mode and refactor spec_file

[marcelotduarte]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 88.88889% with 1 line in your changes missing coverage. Please review.

Project coverage is 79.85%. Comparing base (deaaf55) to head (27b83bc).
Report is 95 commits behind head on main.

Files with missing lines	Patch %	Lines
cx_Freeze/command/bdist_rpm.py	88.88%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2488   +/-   ##
=======================================
  Coverage   79.84%   79.85%           
=======================================
  Files          27       27           
  Lines        4089     4080    -9     
=======================================
- Hits         3265     3258    -7     
+ Misses        824      822    -2     

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