RpmSpec: add a new kind, "bcond"

[masatake]

Update the parser version to 1.1.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.87%. Comparing base (dbf052f) to head (af528c2).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4335   +/-   ##
=======================================
  Coverage   85.87%   85.87%           
=======================================
  Files         252      252           
  Lines       62587    62597   +10     
=======================================
+ Hits        53745    53755   +10     
  Misses       8842     8842           

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