checkconstraints: add -M/--multibuild-package

[andreas-schwab]

No description provided.

[codecov]

Codecov Report

Patch coverage: 16.27% and project coverage change: -0.02% ⚠️

Comparison is base (baeca0b) 29.32% compared to head (657c450) 29.31%.
Report is 8 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1400      +/-   ##
==========================================
- Coverage   29.32%   29.31%   -0.02%     
==========================================
  Files          47       47              
  Lines       17263    17291      +28     
==========================================
+ Hits         5063     5069       +6     
- Misses      12200    12222      +22     

Files Changed	Coverage Δ
osc/build.py	6.39% <0.00%> (ø)
osc/commandline.py	19.05% <12.50%> (-0.01%)	⬇️
osc/core.py	35.19% <15.78%> (-0.07%)	⬇️
osc/__init__.py	100.00% <100.00%> (ø)
osc/conf.py	48.96% <100.00%> (+0.23%)	⬆️

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