Support customize vcpkg directory when INTEGRATE_VCPKG is ON #417
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Motivation
Currently when INTEGRATE_VCPKG is ON, the CMAKE_TOOLCHAIN_FILE variable is always a subdirectory of
${CMAKE_SOURCE_DIR}/vcpkg
. We can only customize the vcpkg directory when INTEGRATE_VCPKG is OFF, while the legacy CMake logic is incompatible with this way.Modifications
When INTEGRATE_VCPKG is ON, only set CMAKE_TOOLCHAIN_FILE if it's not defined. The workflow and README are updated for it.