Fix simer duplicate yaml files passed to ModelC. #119

Job	Run time
build (linux-amd64)	1m 44s
build (linux-x86)	1m 36s
build (windows-x64)	3m 41s
build (windows-x86)	2m 57s
test (linux-amd64)	48s
tools	1m 18s
publish (linux-amd64)	7s
container (modelc, linux-amd64)	46s
publish (linux-x86)	9s
container (modelc-x86, linux-x86)	50s
publish (windows-x64)	5s
container (simbus-sa, linux-amd64)	39s
publish (windows-x86)	10s
	14m 50s

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