Ryzom Client: build on multiple platforms (vcpkg)

add vcpkg overlay port for cpptest and fix lua include paths in target #21

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Run time

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Job	Run time
build (windows-2022)	17m 33s
build (ubuntu-22.04)	10m 7s
build (ubuntu-24.04)	8m 59s
build (windows-2025)	17m 33s
build (macos-13)	1s
	54m 13s