Move libdrm target behind conditional

ui/ozone/platform/dri/gbm.gypi

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'variables': {
     'internal_ozone_platform_deps': [
       'ozone_platform_gbm',
     ],
     'internal_ozone_platforms': [
       'gbm',
     ],
   },
   'targets': [
     {
       'target_name': 'ozone_platform_gbm',
       'type': 'static_library',
       'dependencies': [
         '../../base/base.gyp:base',
-        '../../build/linux/system.gyp:dridrm',
+        '../../build/linux/system.gyp:libdrm',
         '../../build/linux/system.gyp:gbm',
         '../../skia/skia.gyp:skia',
         '../../third_party/khronos/khronos.gyp:khronos_headers',
         '../base/ui_base.gyp:ui_base',
         '../events/events.gyp:events',
         '../events/ozone/events_ozone.gyp:events_ozone',
         '../gfx/gfx.gyp:gfx',
       ],
       'defines': [
         'OZONE_IMPLEMENTATION',
@@ skipping 16 matching lines @@
         'gpu_platform_support_gbm.cc',
         'gpu_platform_support_gbm.h',
         'gpu_platform_support_host_gbm.cc',
         'gpu_platform_support_host_gbm.h',
         'ozone_platform_gbm.cc',
         'ozone_platform_gbm.h',
       ],
     },
   ],
 }