vcpkg: Remove SDL "base" feature
It has been removed upstream, see https://github.com/microsoft/vcpkg/commit/ea9f45d1bc03efbf43a3bbd0788d6a433b8fe445
monado builds on windows and the debug gui works with XRT_DEBUG_GUI=1 on without it.
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It has been removed upstream, see https://github.com/microsoft/vcpkg/commit/ea9f45d1bc03efbf43a3bbd0788d6a433b8fe445
monado builds on windows and the debug gui works with XRT_DEBUG_GUI=1 on without it.