RCPP-8 Prepare vcpkg for submission #229

Job	Run time
build (ubuntu-latest, Debug, True)	11m 54s
build (ubuntu-latest, Debug, False)	12m 27s
build (ubuntu-latest, Release, True)	9m 41s
build (ubuntu-latest, Release, False)	9m 40s
build (windows-latest, Debug, True)	20m 44s
build (windows-latest, Debug, False)	21m 27s
build (windows-latest, Release, True)	12m 30s
build (windows-latest, Release, False)	12m 16s
build (macos-latest, Debug, True)	9m 42s
build (macos-latest, Debug, False)	9m 22s
build (macos-latest, Release, True)	28m 53s
build (macos-latest, Release, False)	9m 50s
	2h 48m 26s

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