Notice about changes in building steps

[Cheng Zhao]

Hi all,

If you're not building your own node-webkit on Windows, you can skip now.

When investigating the issue #185 [1], we found that Chromium assumes
DirectX SDK to exist under "src/third_party/directxsdk", otherwise
some important dlls won't be generated.

To fix it, you should copy all DirectX SDK files into
"path/to/node-webkit/src/third_party/directxsdk/files", in cygwin, do:

mkdir -p /path/to/node-webkit/src/third_party/directxsdk/files
cp -r /c/Program\ Files\ \(x86\)/Microsoft\ DirectX\ SDK\ \(June\
2010\)/* /path/to/node-webkit/src/third_party/directxsdk/files/

The building documentation has been updated for this. [2]

[1] https://github.com/rogerwang/node-webkit/issues/185
[2] https://github.com/rogerwang/node-webkit/wiki/Building-node-webkit

--
Cheng
Intel Open Source Technology Center