Improvements to GYP build

src/common/common.gyp

Index: src/common/common.gyp
diff --git a/src/common/common.gyp b/src/common/common.gyp
index 5a666de61f0301f8993103aa69e3fda71c0244f3..96e1bced6a5e410a7b191dd19388b8ff4f637845 100644
--- a/src/common/common.gyp
+++ b/src/common/common.gyp
@@ -35,6 +35,11 @@
       ['OS=="linux"', {
         'defines': ['HAVE_A_OUT_H'],
       }],
+      ['OS!="android"', {'sources/': [['exclude', 'android/']]}],

[Mark Mentovai, 2016/01/28 17:29:22]

Tighter anchoring: '(^|/)android/', etc.

+      ['OS!="linux"',   {'sources/': [['exclude', 'linux/'  ]]}],

[Mark Mentovai, 2016/01/28 17:29:22]

We don’t usually bother with the extra whitespace to line things up. It just
makes diffs and history extra annoying when someone comes up with a new platform
whose name is longer than 7 characters.

+      ['OS!="mac"',     {'sources/': [['exclude', 'mac/'    ]]}],
+      ['OS!="solaris"', {'sources/': [['exclude', 'solaris/']]}],
+      ['OS!="win"',     {'sources/': [['exclude', 'windows/']]}],
     ],
   },
   'targets': [