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>

meson.build

@@ -39,7 +39,7 @@ dir_module_libweston = join_paths(dir_lib, 'libweston-@0@'.format(libweston_majo
 dir_data_pc = join_paths(dir_data, 'pkgconfig')
 dir_lib_pc = join_paths(dir_lib, 'pkgconfig')
 dir_man = join_paths(dir_prefix, get_option('mandir'))
-dir_protocol_libweston = 'weston/protocols' # XXX: this should be 'libweston'
+dir_protocol_libweston = 'libweston/protocols'
 
 pkgconfig = import('pkgconfig')