xwayland: require xcb-xfixes 1.15

xcb-xfixes 1.15 was released back in 2022. Let's simplify our build
setup by requiring it.

xwayland/meson.build

@@ -1,13 +1,13 @@
 xwayland_libs = []
-xwayland_required = [
-	'xcb',
-	'xcb-composite',
-	'xcb-ewmh',
-	'xcb-icccm',
-	'xcb-render',
-	'xcb-res',
-	'xcb-xfixes',
-]
+xwayland_required = {
+	'xcb': [],
+	'xcb-composite': [],
+	'xcb-ewmh': [],
+	'xcb-icccm': [],
+	'xcb-render': [],
+	'xcb-res': [],
+	'xcb-xfixes': '>=1.15',
+}
 xwayland_optional = {
 	'xcb-errors': 'Required for printing X11 errors.',
 }
@@ -37,8 +37,9 @@ if not xwayland.found()
 	subdir_done()
 endif
 
-foreach lib : xwayland_required
+foreach lib, version : xwayland_required
 	dep = dependency(lib,
+		version: version,
 		required: get_option('xwayland'),
 		not_found_message: '\n'.join(msg).format(lib),
 	)
@@ -93,6 +94,3 @@ wlr_files += files(
 )
 wlr_deps += xwayland_libs
 features += { 'xwayland': true }
-
-have = cc.has_function('xcb_xfixes_set_client_disconnect_mode', dependencies: xwayland_libs)
-internal_config.set10('HAVE_XCB_XFIXES_SET_CLIENT_DISCONNECT_MODE', have)

xwayland/xwayland.c

@@ -145,9 +145,7 @@ struct wlr_xwayland *wlr_xwayland_create(struct wl_display *wl_display,
 	struct wlr_xwayland_server_options options = {
 		.lazy = lazy,
 		.enable_wm = true,
-#if HAVE_XCB_XFIXES_SET_CLIENT_DISCONNECT_MODE
 		.terminate_delay = lazy ? 10 : 0,
-#endif
 	};
 	struct wlr_xwayland_server *server = wlr_xwayland_server_create(wl_display, &options);
 	if (server == NULL) {

xwayland/xwm.c

@@ -1,7 +1,6 @@
 #include <assert.h>
 #include <stdlib.h>
 #include <unistd.h>
-#include <wlr/config.h>
 #include <wlr/types/wlr_compositor.h>
 #include <wlr/types/wlr_data_device.h>
 #include <wlr/types/wlr_primary_selection.h>
@@ -2584,13 +2583,11 @@ struct wlr_xwm *xwm_create(struct wlr_xwayland *xwayland, int wm_fd) {
 		sizeof(supported)/sizeof(*supported),
 		supported);
 
-#if HAVE_XCB_XFIXES_SET_CLIENT_DISCONNECT_MODE
 	if (xwm->xwayland->server->options.terminate_delay > 0 &&
 			xwm->xfixes_major_version >= 6) {
 		xcb_xfixes_set_client_disconnect_mode(xwm->xcb_conn,
 			XCB_XFIXES_CLIENT_DISCONNECT_FLAGS_TERMINATE);
 	}
-#endif
 
 	xcb_flush(xwm->xcb_conn);