Makefile: Delete Golden Files Section

[SkycoinSynth]

Delete every reference to "golden files" in makefile

Then test.

---

update-golden-files: build ## Update golden files used in CX test suite
ls -1 tests/ | grep '.cx$$' | while read -r NAME; do echo "Processing $$NAME"; cx -t -co tests/testdata/tokens/$${NAME}.txt tests/$$NAME || true ; done

check-golden-files: update-golden-files ## Ensure golden files are up to date
if [ "$(shell git diff tests/testdata | wc -l | tr -d ' ')" != "0" ] ; then echo 'Changes detected. Golden files not up to date' ; exit 2 ; fi

check: check-golden-files test ## Perform self-tests

[amherag]

Fixed by #320.