Add args.gn to deterministic_build_ignorelist for Linux

args.gn has been a dependency for blink_web_tests_support_data for a while,
but it isn't deterministic.

TBR=thakis@chromium.org

Bug: 1135151
Change-Id: I8f56ad9d25c4453e1afbb8e5ddaaf7295dc5c004
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2449930Reviewed-by: Chris Sharp <csharp@chromium.org>
Commit-Queue: Chris Sharp <csharp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813755}

tools/determinism/deterministic_build_ignorelist.pyl

@@ -61,6 +61,9 @@
     'test_data/ppapi/tests/extensions/packaged_app/newlib/ppapi_tests_extensions_packaged_app_newlib_x86_64.nexe',
     'test_data/ppapi/tests/extensions/popup/newlib/ppapi_tests_extensions_popup_newlib_x86_64.nexe',
     'test_data/ppapi/tests/extensions/socket_permissions/newlib/ppapi_tests_extensions_socket_permissions_newlib_x86_64.nexe',
+
+    # https://crbug.com/1135151
+    'args.gn',
   ],
 
   'linux_component': [