build: Fix LunarXchange Issue 862
build: Fix LunarXchange Issue 862

Modified MoltenVK build arguments for MacOS from
`MVK_LOGGING_ENABLED=0` to `MVK_CONFIG_LOG_LEVEL=1`.

This allows users to set the logging information they
want when an application is run using MoltenVK.

By default, only errors are logged.

Change-Id: I471fa28e68b5dc68b10ae17858475981158b2a86

KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools