GYP: recognize OpenBSD/amd64 as x64 as it's called in this world

build/common.gypi

 # Copyright (c) 2009 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.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   'variables': {
     # .gyp files should set chromium_code to 1 if they build Chromium-specific
@@ skipping 20 matching lines @@
       # TODO(mmoss) Once 'buildtype' is fully supported (e.g. Windows gyp
       # conversion is done), some of the things which are now controlled by
       # 'branding', such as symbol generation, will need to be refactored based
       # on 'buildtype' (i.e. we don't care about saving symbols for non-Official
       # builds).
       'buildtype%': 'Dev',
 
       'variables': {
         # Compute the architecture that we're building on.
         'conditions': [
-          [ 'OS=="linux" or OS=="freebsd"', {
+          [ 'OS=="linux" or OS=="freebsd" or OS=="openbsd"', {
             # This handles the Linux platforms we generally deal with. Anything
             # else gets passed through, which probably won't work very well; such
             # hosts should pass an explicit target_arch to gyp.
             'host_arch%':
               '<!(uname -m | sed -e "s/i.86/ia32/;s/x86_64/x64/;s/amd64/x64/;s/arm.*/arm/")',
           }, {  # OS!="linux"
             'host_arch%': 'ia32',
           }],
         ],
       },
@@ skipping 1108 matching lines @@
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }
 
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