libweston: fix protocol install path
These protocols are from libweston, not weston.
Even the pkg-config files is called libweston-6-protocols.pc.
Signed-off-by: 
Pekka Paalanen <pekka.paalanen@collabora.com>
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These protocols are from libweston, not weston.
Even the pkg-config files is called libweston-6-protocols.pc.
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>