use rustified enums instead of free constants

[xmakro]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 10 lines in your changes missing coverage. Please review.

Project coverage is 6.8%. Comparing base (5e66bf7) to head (16ed114).

Files with missing lines	Patch %	Lines
ibverbs/src/lib.rs	0.0%	8 Missing ⚠️
ibverbs-sys/src/lib.rs	0.0%	2 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
ibverbs-sys/src/lib.rs	12.4% <0.0%> (ø)
ibverbs/src/lib.rs	6.2% <0.0%> (-0.1%)	⬇️

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