Fix stack list processing. #244

Job	Run time
build (linux-amd64)	2m 57s
build (linux-x86)	1m 5s
build (linux-i386)	1m 8s
build (windows-x64)	2m 23s
build (windows-x86)	1m 49s
runtimes (testscript)	1m 9s
tools	1m 49s
test_e2e	1m 3s
publish (linux-amd64)	5s
containers (modelc, linux-amd64)	29s
docker_push (simer)	26s
publish (linux-x86)	4s
containers (modelc-x86, linux-x86)	42s
docker_push (testscript)	29s
publish (linux-i386)	9s
containers (simbus-sa, linux-amd64)	23s
publish (windows-x64)	5s
publish (windows-x86)	9s
	16m 24s

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