move xwm.h out of include/wlr

xwm.h was meant to be private, so move it to include/xwayland/xwm.h
We had an ifdef WLR_HAS_XCB_ICCCM in xwayland.h which was easy to move
to xwm, it is not safe to use the WLR_HAS_* in the public headers.

I checked a few of our current users and none rely on xwm.h being
public as expected (rootston, sway, hsroots)

include/wlr/xwayland.h

@@ -8,10 +8,6 @@
 #include <wlr/types/wlr_seat.h>
 #include <xcb/xcb.h>
 
-#ifdef WLR_HAS_XCB_ICCCM
-	#include <xcb/xcb_icccm.h>
-#endif
-
 struct wlr_xwm;
 struct wlr_xwayland_cursor;
 

include/xwayland/xwm.h

@@ -5,6 +5,13 @@
 #include <wlr/xwayland.h>
 #include <xcb/render.h>
 
+#ifdef WLR_HAS_XCB_ICCCM
+	#include <xcb/xcb_icccm.h>
+#endif
+#ifdef WLR_HAS_XCB_ERRORS
+	#include <xcb/xcb_errors.h>
+#endif
+
 enum atom_name {
 	WL_SURFACE_ID,
 	WM_DELETE_WINDOW,

meson.build

@@ -103,7 +103,6 @@ if get_option('enable_xwayland')
 	conf_data.set('WLR_HAS_XWAYLAND', true)
 else
 	exclude_headers += 'xwayland.h'
-	exclude_headers += 'xwm.h'
 endif
 exclude_headers += 'meson.build'
 install_subdir('include/wlr', install_dir: 'include', exclude_files: exclude_headers)

xwayland/selection.c

@@ -7,8 +7,8 @@
 #include <wlr/types/wlr_data_device.h>
 #include <wlr/types/wlr_primary_selection.h>
 #include <wlr/util/log.h>
-#include <wlr/xwm.h>
 #include <xcb/xfixes.h>
+#include "xwayland/xwm.h"
 
 static const size_t incr_chunk_size = 64 * 1024;
 

xwayland/xwayland.c

@@ -18,9 +18,9 @@
 #include <wayland-server.h>
 #include <wlr/util/log.h>
 #include <wlr/xwayland.h>
-#include <wlr/xwm.h>
 #include "sockets.h"
 #include "util/signal.h"
+#include "xwayland/xwm.h"
 
 #ifdef __FreeBSD__
 static inline int clearenv(void) {

xwayland/xwm.c

@@ -9,19 +9,12 @@
 #include <wlr/util/log.h>
 #include <wlr/xcursor.h>
 #include <wlr/xwayland.h>
-#include <wlr/xwm.h>
 #include <xcb/composite.h>
 #include <xcb/render.h>
 #include <xcb/xcb_image.h>
 #include <xcb/xfixes.h>
 #include "util/signal.h"
-
-#ifdef WLR_HAS_XCB_ICCCM
-	#include <xcb/xcb_icccm.h>
-#endif
-#ifdef WLR_HAS_XCB_ERRORS
-	#include <xcb/xcb_errors.h>
-#endif
+#include "xwayland/xwm.h"
 
 const char *atom_map[ATOM_LAST] = {
 	"WL_SURFACE_ID",