MobileVLCKit: umbrella header for module 'MobileVLCKit' does not include header '/vlc/libvlc.h'

On master, we have 15 warnings complaining about:

umbrella header for module 'MobileVLCKit' does not include header '/vlc/libvlc.h'

This seems to be new with the latest 3.3.18b6

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