Make: Properly handle relative paths in common.mk

[tjanez]

No description provided.

[codecov]

Codecov Report

Merging #3345 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3345   +/-   ##
=======================================
  Coverage   65.39%   65.39%           
=======================================
  Files         371      371           
  Lines       33151    33151           
=======================================
  Hits        21680    21680           
- Misses       8267     8280   +13     
+ Partials     3204     3191   -13     

Impacted Files	Coverage Δ
go/storage/mkvs/checkpoint/checkpointer.go	64.75% <0.00%> (-15.58%)	⬇️
go/worker/compute/executor/committee/state.go	71.42% <0.00%> (-14.29%)	⬇️
go/common/grpc/policy/policy.go	62.12% <0.00%> (-7.58%)	⬇️
...nsensus/tendermint/apps/staking/signing_rewards.go	20.00% <0.00%> (-5.72%)	⬇️
go/consensus/tendermint/apps/staking/staking.go	50.80% <0.00%> (-3.23%)	⬇️
go/roothash/api/commitment/pool.go	72.48% <0.00%> (-2.63%)	⬇️
go/consensus/tendermint/apps/staking/fees.go	47.82% <0.00%> (-1.45%)	⬇️
go/consensus/tendermint/abci/mux.go	53.09% <0.00%> (-1.13%)	⬇️
go/worker/compute/executor/committee/node.go	63.30% <0.00%> (-1.11%)	⬇️
go/staking/api/grpc.go	57.14% <0.00%> (-0.85%)	⬇️
... and 24 more

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