meson/tests: add missing dependencies on protocol headers

In file included from ../tests/connection-test.c:43:
In file included from ../tests/test-compositor.h:30:
../src/wayland-client.h:40:10: fatal error: 'wayland-client-protocol.h' file not found
 #include "wayland-client-protocol.h"
          ^~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from ../tests/display-test.c:45:
In file included from ../src/wayland-server.h:104:
src/wayland-server-protocol.h:4454:2: error: unterminated /* comment
        /**
        ^
In file included from ../tests/cpp-compile-test.cpp:2:
In file included from src/wayland-server-protocol.h:8:
In file included from ../src/wayland-server.h:104:
src/wayland-server-protocol.h:3:2: error: unterminated conditional directive
 #ifndef WAYLAND_SERVER_PROTOCOL_H
  ^
../tests/headers-protocol-test.c:33:2: error: including wayland-server-protocol.h did not include wayland-server.h!
 #error including wayland-server-protocol.h did not include wayland-server.h!
  ^
In file included from ../tests/headers-protocol-test.c:26:
In file included from src/wayland-client-protocol.h:8:
In file included from ../src/wayland-client.h:40:
src/wayland-client-protocol.h:1358:2: error: unterminated conditional directive
 #ifndef WL_SHM_FORMAT_ENUM
  ^
In file included from ../tests/protocol-logger-test.c:34:
In file included from ../src/wayland-client.h:40:
src/wayland-client-protocol.h:2613:1: error: unterminated /* comment
/**
^
../tests/resources-test.c:49:36: error: use of undeclared identifier 'wl_seat_interface'
        res = wl_resource_create(client, &wl_seat_interface, 4, 0);
                                          ^