devel/pkgconfig removed share/pkgconfig from PKG_DEFAULT_PATH
via --with-pkg-config-dir override. Similar to lib/pkgconfig.

--- meson.build.orig	2021-11-26 04:47:33 UTC
+++ meson.build
@@ -91,7 +91,7 @@ pkgconfig_configuration.set('abs_top_srcdir', wayland_
 pkgconfig_configuration.set('PACKAGE', 'wayland-protocols')
 pkgconfig_configuration.set('WAYLAND_PROTOCOLS_VERSION', wayland_protocols_version)
 
-pkg_install_dir = join_paths(get_option('datadir'), 'pkgconfig')
+pkg_install_dir = join_paths(get_option('prefix'), 'libdata/pkgconfig')
 configure_file(
 	input: 'wayland-protocols.pc.in',
 	output: 'wayland-protocols.pc',