bdist_rpm: fix issue with install prefix

[marcelotduarte]

The issue is reported #2039 (comment)

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (8d9664b) 51.37% compared to head (a0c77fa) 51.32%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2075      +/-   ##
==========================================
- Coverage   51.37%   51.32%   -0.05%     
==========================================
  Files          70       70              
  Lines        5873     5868       -5     
==========================================
- Hits         3017     3012       -5     
  Misses       2856     2856              

Files	Coverage Δ
cx_Freeze/command/install.py	89.79% <ø> (ø)
cx_Freeze/command/install_exe.py	92.50% <ø> (-2.50%)	⬇️
cx_Freeze/command/bdist_rpm.py	87.20% <80.00%> (+0.53%)	⬆️

... and 1 file with indirect coverage changes

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.