xwayland: unbreak with xorgproto as subproject

Jan Beich requested to merge jbeich/xserver:xwaylandproto_subproject into master
$ pkg info -x xorgproto

$ git clone https://gitlab.freedesktop.org/xorg/proto/xorgproto.git subprojects/xorgproto
$ meson setup _build
Run-time dependency xwaylandproto found: NO (tried pkgconfig and cmake)
Looking for a fallback subproject for the dependency xwaylandproto

Executing subproject xorgproto

xorgproto| Project name: xorgproto
xorgproto| Project version: 2022.2
$ meson compile -C _build
../hw/xwayland/xwayland.c:306:10: fatal error: 'X11/extensions/xwaylandproto.h' file not found
#include <X11/extensions/xwaylandproto.h>
1 error generated.
Edited by Jan Beich

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