xlib: fix mixing xcb & xlib calls

NextRequest is a macro that doesn't mix well with xcb, since
dpy->request is not updated. Instead use XNextRequest() that was fixed
to do the right thing with xcb in libX11 commit:
http://cgit.freedesktop.org/xorg/lib/libX11/commit/?id=7f8f9a36ef901f31279c385caf960a22daeb33fe

This may solve application X errors when a shmdt() is called by cairo
before the Attach request is processed.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Uli Schlachter <psychon@znc.in>

src/cairo-xlib-surface-shm.c

@@ -441,7 +441,7 @@ static void send_event(cairo_xlib_display_t *display,
 
     ev.type = display->shm->event;
     ev.send_event = 1; /* XXX or lie? */
-    ev.serial = NextRequest (display->display);
+    ev.serial = XNextRequest (display->display);
     ev.drawable = display->shm->window;
     ev.major_code = display->shm->opcode;
     ev.minor_code = X_ShmPutImage;
@@ -599,7 +599,7 @@ _cairo_xlib_shm_pool_create(cairo_xlib_display_t *display,
 	goto cleanup;
     }
 
-    pool->attached = NextRequest (dpy);
+    pool->attached = XNextRequest (dpy);
     success = XShmAttach (dpy, &pool->shm);
 #if !IPC_RMID_DEFERRED_RELEASE
     XSync (dpy, FALSE);
@@ -1200,7 +1200,7 @@ _cairo_xlib_shm_surface_mark_active (cairo_surface_t *_shm)
     cairo_xlib_shm_surface_t *shm = (cairo_xlib_shm_surface_t *) _shm;
     cairo_xlib_display_t *display = (cairo_xlib_display_t *) _shm->device;
 
-    shm->active = NextRequest (display->display);
+    shm->active = XNextRequest (display->display);
 }
 
 void
@@ -1242,7 +1242,7 @@ _cairo_xlib_shm_surface_get_obdata (cairo_surface_t *surface)
     cairo_xlib_display_t *display = (cairo_xlib_display_t *) surface->device;
     cairo_xlib_shm_surface_t *shm = (cairo_xlib_shm_surface_t *) surface;
 
-    display->shm->last_event = shm->active = NextRequest (display->display);
+    display->shm->last_event = shm->active = XNextRequest (display->display);
     return &shm->info->pool->shm;
 }