[MSVC] Set default path for libraries under MSVC #6503
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This is needed because, quite simply, expecting a dev to explicitly set all 61 of these variables, and then also disable the 5 extensions as well, is just a bit impractical, and, unless they know how CMake handles dependencies internally, they would only be able to use a single configuration, either debug or release, depending on which specific library they referred to in each variable, because you can't mix debug and release objects with MSVC.
This is intended to work with the package of dependencies I've setup here, along the same style as PHP.
With this, a dev that has that dependency pack setup correctly only has to set the path to Boost, and, for now at least, UODBC, as it's not auto-detected correctly at the moment. This massively reduces the effort required for a new developer to get HHVM configured for MSVC.