wayland/display: Fix mmap use

> From version 7 onwards, the fd must be mapped with MAP_PRIVATE by the recipient, as MAP_SHARED may fail.

 - https://wayland.freedesktop.org/docs/html/apa.html#protocol-spec-wl_keyboard

Signed-off-by: Samuel Dionne-Riel <samuel@dionne-riel.com>

source/wayland/display.c

@@ -347,7 +347,7 @@ static void wayland_keyboard_keymap(void *data, struct wl_keyboard *keyboard,
     return;
   }
 
-  char *str = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, 0);
+  char *str = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
   if (str == MAP_FAILED) {
     close(fd);
     return;