RCPP-8 Prepare vcpkg for submission #228

Job	Run time
build (ubuntu-latest, Debug, True)	11m 52s
build (ubuntu-latest, Debug, False)	11m 27s
build (ubuntu-latest, Release, True)	9m 56s
build (ubuntu-latest, Release, False)	9m 51s
build (windows-latest, Debug, True)	20m 27s
build (windows-latest, Debug, False)	6h 0m 6s
build (windows-latest, Release, True)	13m 22s
build (windows-latest, Release, False)	13m 11s
build (macos-latest, Debug, True)	4m 23s
build (macos-latest, Debug, False)	5m 22s
build (macos-latest, Release, True)	6m 21s
build (macos-latest, Release, False)	5m 13s
	7h 51m 31s

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