Fix #7736: remove -i flag from GOFLAGS

[Sr4l]

Fix #7736: this flag is not needed for Go versions >=1.10 and creates problems
while building. see golang/go#27285 (comment)

[sapk]

Thanks for your contrib.

[codecov-io]

Codecov Report

Merging #7778 into master will increase coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #7778      +/-   ##
==========================================
+ Coverage    41.3%   41.31%   +<.01%     
==========================================
  Files         474      474              
  Lines       63837    63837              
==========================================
+ Hits        26371    26377       +6     
+ Misses      34028    34021       -7     
- Partials     3438     3439       +1

Impacted Files	Coverage Δ
modules/log/event.go	64.61% <0%> (-1.03%)	⬇️
models/repo_list.go	73.09% <0%> (+1.01%)	⬆️
routers/repo/view.go	43.25% <0%> (+1.01%)	⬆️
models/unit.go	67.56% <0%> (+5.4%)	⬆️

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