Remove unused X11/drm auth code

The code was added back in 2020 and seemingly never built. Just drop it
- if needed it can be git reverted at some point.

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>

src/auth.cpp

@@ -1,56 +0,0 @@
-/*
-    Inspired by radeontop
-*/
-#include "auth.h"
-#include <xcb/xcb.h>
-#include <xcb/dri2.h>
-#include <xf86drm.h>
-#include <libdrm/amdgpu_drm.h>
-#include <libdrm/amdgpu.h>
-#include <cstdlib>
-#include <cstdio>
-
-/* Try to authenticate the DRM client with help from the X server. */
-bool authenticate_drm_xcb(drm_magic_t magic) {
-    xcb_connection_t *conn = xcb_connect(NULL, NULL);
-    if (!conn) {
-        return false;
-    }
-    if (xcb_connection_has_error(conn)) {
-        xcb_disconnect(conn);
-        return false;
-    }
-
-    xcb_screen_t *screen = xcb_setup_roots_iterator(xcb_get_setup(conn)).data;
-    xcb_window_t window = screen->root;
-
-    /* Authenticate our client via the X server using the magic. */
-    xcb_dri2_authenticate_cookie_t auth_cookie =
-        xcb_dri2_authenticate(conn, window, magic);
-    xcb_dri2_authenticate_reply_t *auth_reply =
-        xcb_dri2_authenticate_reply(conn, auth_cookie, NULL);
-    free(auth_reply);
-
-    xcb_disconnect(conn);
-    return true;
-}
-
-bool authenticate_drm(int fd) {
-    drm_magic_t magic;
-
-    /* Obtain magic for our DRM client. */
-    if (drmGetMagic(fd, &magic) < 0) {
-        return false;
-    }
-
-    /* Try self-authenticate (if we are somehow the master). */
-    if (drmAuthMagic(fd, magic) == 0) {
-        if (drmDropMaster(fd)) {
-            perror("MANGOHUD: Failed to drop DRM master");
-            fprintf(stderr, "\n\tWARNING: other DRM clients will crash on VT switch\n");
-        }
-        return true;
-    }
-
-    return authenticate_drm_xcb(magic);
-}

src/auth.h

@@ -1,5 +0,0 @@
-#pragma once
-#include <libdrm/drm.h>
-
-bool authenticate_drm_xcb(drm_magic_t magic);
-bool authenticate_drm(int fd);

src/gpu.cpp

@@ -12,7 +12,6 @@
 #endif
 
 #ifdef HAVE_LIBDRM_AMDGPU
-//#include "auth.h"
 #include <xf86drm.h>
 #include <libdrm/amdgpu_drm.h>
 #include <libdrm/amdgpu.h>
@@ -259,13 +258,6 @@ bool amdgpu_open(const char *path) {
     }
     g_libdrm.drmFreeVersion(ver);
 
-/*
-    if (!authenticate_drm(fd)) {
-        close(fd);
-        return false;
-    }
-*/
-
     uint32_t drm_major, drm_minor;
     amdgpu_device_handle dev;
     if (libdrm_amdgpu_ptr->amdgpu_device_initialize(fd, &drm_major, &drm_minor, &dev)){