fix fix-machos when signing fails #310

Job	Run time
unit-tests	20s
local-edit-tests	46s
unavailable	17s
stark.com/foo (linux)	34s
git-clone.com (linux)	42s
fix-machos.com (linux)	35s
git-clone.com (mac)	50s
stark.com/foo@1.2.3 (linux)	46s
pyapp.com/poetry (linux)	1m 40s
pyapp.com/poetry (mac)	47s
version-transformer.com (mac)	1m 2s
pc-cmake.com (mac)	53s
fix-machos.com (mac)	59s
stark.com/foo (mac)	37s
pyapp.com/pip (mac)	1m 1s
stark.com/foo@1.2.3 (mac)	37s
version-transformer.com (linux)	39s
toolchain.com (mac)	31s
pc-cmake.com (linux)	46s
toolchain.com (linux)	1m 23s
pyapp.com/pip (linux)	57s
	16m 42s

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