addon.gypi: define _LARGEFILE_SOURCE, _FILE_OFFSET_BITS

Since as of joyent/node@83e5e20c2c, these are no
longer defined in node's commong.gypi file, so we need to define them here as
well.

addon.gypi

@@ -17,6 +17,7 @@
 
     'conditions': [
       [ 'OS=="mac"', {
+        'defines': [ '_DARWIN_USE_64_BIT_INODE=1' ],
         'libraries': [ '-undefined dynamic_lookup' ],
         'xcode_settings': {
           'DYLIB_INSTALL_NAME_BASE': '@rpath'
@@ -27,6 +28,9 @@
         # warning C4251: 'node::ObjectWrap::handle_' : class 'v8::Persistent<T>'
         # needs to have dll-interface to be used by clients of class 'node::ObjectWrap'
         'msvs_disabled_warnings': [ 4251 ],
+      }, {
+        # OS!="win"
+        'defines': [ '_LARGEFILE_SOURCE', '_FILE_OFFSET_BITS=64' ],
       }],
       [ 'OS=="freebsd" or OS=="openbsd" or OS=="solaris" or (OS=="linux" and target_arch!="ia32")', {
         'cflags': [ '-fPIC' ],