Revert "Workaround to Travis-CI Wine/Mingw build hanging occasionally"
This reverts D497. It doesn't provide any value since we don't do Travis
anymore, and the Makefile.test.include changes may provide some nuisances
down the road.
Test Plan: make check
Reviewers: deadalnix, Fabien, jasonbcox, #bitcoin_abc
Reviewed By: deadalnix, #bitcoin_abc
Differential Revision: https://reviews.bitcoinabc.org/D3537