Fixing cmake configuration for multi-config generators#450

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i-sultan wants to merge 3 commits intoRenderKit:develfrom

i-sultan:multi_config_fix

Commits on Aug 6, 2020

Fixing cmake build configuration for multi-config generators
i-sultan
committed

Commits on Aug 9, 2020

removing ospray_configure_build_type since it requires cmake file generation
i-sultan
committed
Removing OSPRAY_BUILD_RELEASE/DEBUG/RELWITHDEBINFO from the config file
i-sultan
committed