x64-windows is forced if host is 64 bit regardless of architecture selected

[louist103]

Automate-VCPKG/automate-vcpkg.cmake

Line 77 in 3bf84eb

if (SIZEOF_VOID_P EQUAL 8)

This causes an issue when trying to cross compile for arm64 as it will select x64 even if the CMake project is configured with -A arm64.
I was able to work around this by adding a check for CMAKE_VS_PLATFORM_NAME VCPKG_TARGET_TRIPLET not being defined on the line linked.