common/fdlimit: build on DragonflyBSD

[ucwong]

No description provided.

[codecov]

Codecov Report

Merging #594 into master will increase coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #594      +/-   ##
==========================================
+ Coverage   44.97%   45.04%   +0.06%     
==========================================
  Files         382      382              
  Lines       47557    47557              
==========================================
+ Hits        21391    21423      +32     
+ Misses      24580    24554      -26     
+ Partials     1586     1580       -6     

Impacted Files	Coverage Δ
p2p/discv5/ticket.go	40.17% <0.00%> (-0.65%)	⬇️
accounts/keystore/keystore.go	64.34% <0.00%> (+0.43%)	⬆️
rpc/client.go	76.23% <0.00%> (+1.23%)	⬆️
core/tx_pool.go	77.40% <0.00%> (+1.73%)	⬆️
accounts/keystore/account_cache.go	91.30% <0.00%> (+1.86%)	⬆️
p2p/discover/lookup.go	97.14% <0.00%> (+1.90%)	⬆️
trie/proof.go	77.98% <0.00%> (+2.61%)	⬆️
trie/sync_bloom.go	65.78% <0.00%> (+5.26%)	⬆️

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