loader: Filter extension list sent to ICD
loader: Filter extension list sent to ICD

The loader needs to filter the ppEnabledExtensionNames list
to only those supported by the ICD to prevent false failures.
(i.e. extensions bound for layers rather than the ICD.)

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