Add missing -Wno-missing-field-initializer flag to standalone.gypi.

Add missing -Wno-missing-field-initializer flag to standalone.gypi.

Chrome uses -Wno-missing-field-initializers when building V8, so we
should better use that as well. It silences warnings generated for the
GTest port files.

BUG=v8:3518
LOG=n
R=jochen@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=23676

[Benedikt Meurer, 2014-09-04 04:40:09]

bmeurer@chromium.org changed reviewers:
+ jochen@chromium.org

[Benedikt Meurer, 2014-09-04 04:40:10]

Jochen: PTAL
Thiago: FYI

[jochen (gone - plz use gerrit), 2014-09-04 09:23:28]

lgtm

[Benedikt Meurer, 2014-09-04 09:23:59]

Committed patchset #1 (id:1) manually as 23676 (presubmit successful).

[tfarina, 2014-09-04 18:23:50]

tfarina@chromium.org changed reviewers:
+ tfarina@chromium.org

[tfarina, 2014-09-04 18:23:50]

lgtm (rubber-stamp).