Fixed redefinition of typedef warnings and errors on BSD

src/video/x11/SDL_x11vulkan.c

@@ -29,9 +29,11 @@
 #include "SDL_x11vulkan.h"
 
 #include <X11/Xlib.h>
-//#include <xcb/xcb.h>
+/*#include <xcb/xcb.h>*/
+/*
 typedef uint32_t xcb_window_t;
 typedef uint32_t xcb_visualid_t;
+*/
 
 int X11_Vulkan_LoadLibrary(_THIS, const char *path)
 {

src/video/x11/SDL_x11vulkan.h

@@ -27,7 +27,7 @@
 
 #if SDL_VIDEO_VULKAN && SDL_VIDEO_DRIVER_X11
 
-typedef struct xcb_connection_t xcb_connection_t;
+/*typedef struct xcb_connection_t xcb_connection_t;*/
 typedef xcb_connection_t *(*PFN_XGetXCBConnection)(Display *dpy);
 
 int X11_Vulkan_LoadLibrary(_THIS, const char *path);