Define os_posix in gyp files to get new Unix platforms added quickly

build/all.gyp

Index: build/all.gyp
diff --git a/build/all.gyp b/build/all.gyp
index 4258761028a4d0653d7d41fec86f1faf0f9ed973..7e269934f66ceef53673160b9e27643019fc913e 100644
--- a/build/all.gyp
+++ b/build/all.gyp
@@ -59,7 +59,7 @@
             '../v8/tools/gyp/v8.gyp:*',
           ],
         }],
-        ['OS=="mac" or OS=="linux" or OS=="freebsd" or OS=="openbsd"', {
+        ['OS=="mac" or OS=="linux"', {
           'dependencies': [
             '../third_party/yasm/yasm.gyp:*#host',
            ],
@@ -88,7 +88,7 @@
             }],
           ],
         }],
-        ['OS=="linux" or OS=="freebsd" or OS=="openbsd"', {
+        ['toolkit_uses_gtk==1', {
           'dependencies': [
             '../tools/gtk_clipboard_dump/gtk_clipboard_dump.gyp:*',
             '../tools/xdisplaycheck/xdisplaycheck.gyp:*',
@@ -284,11 +284,11 @@
         '../chrome/chrome.gyp:chromedriver',
       ],
       'conditions': [
-        ['OS=="mac" or OS=="win" or (OS=="linux" and target_arch==python_arch)', {
+        ['OS=="mac" or OS=="win" or (os_posix==1 and target_arch==python_arch)', {
           'dependencies': [
             '../chrome/chrome.gyp:pyautolib',
           ],
-        }], # 'OS=="mac" or OS=="win" or (OS=="linux" and target_arch==python_arch)'
+        }],
       ],
     }, # target_name: chromium_builder_qa
   ],