Move libdrm target behind conditional

ui/ozone/platform/dri/dri.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_dri',
     ],
     'internal_ozone_platform_unittest_deps': [
       'ozone_platform_dri_unittests',
     ],
     'internal_ozone_platforms': [
       'dri',
     ],
     'use_drm_atomic_flip%': 0,
   },
   'targets': [
     {
       'target_name': 'ozone_platform_dri',
       'type': 'static_library',
       'dependencies': [
         '../../base/base.gyp:base',
-        '../../build/linux/system.gyp:dridrm',
+        '../../build/linux/system.gyp:libdrm',
         '../../skia/skia.gyp:skia',
         '../base/ui_base.gyp:ui_base',
         '../display/display.gyp:display_types',
         '../display/display.gyp:display_util',
         '../events/events.gyp:events',
         '../events/ozone/events_ozone.gyp:events_ozone_evdev',
         '../gfx/gfx.gyp:gfx',
         '../gfx/gfx.gyp:gfx_geometry',
       ],
       'defines': [
@@ skipping 44 matching lines @@
             'hardware_display_plane_manager.cc',
             'hardware_display_plane_manager.h',
           ],
         }],
       ],      
     },
     {
       'target_name': 'ozone_platform_dri_unittests',
       'type': 'none',
       'dependencies': [
-        '../../build/linux/system.gyp:dridrm',
+        '../../build/linux/system.gyp:libdrm',
         '../../skia/skia.gyp:skia',
         '../gfx/gfx.gyp:gfx_geometry',
         'ozone_platform_dri',
       ],
       'export_dependent_settings': [
-        '../../build/linux/system.gyp:dridrm',
+        '../../build/linux/system.gyp:libdrm',
         '../../skia/skia.gyp:skia',
         '../gfx/gfx.gyp:gfx_geometry',
       ],
       'direct_dependent_settings': {
         'sources': [
           'dri_surface_factory_unittest.cc',
           'dri_surface_unittest.cc',
           'hardware_display_controller_unittest.cc',
           'screen_manager_unittest.cc',
           'test/mock_dri_wrapper.cc',
           'test/mock_dri_wrapper.h',
         ],
       },
     },
   ],
 }