Fix include path when pointing to Node.js source

Header files for deps are in a different location in the Node.js
source tree compared to the release tarballs.

PR-URL: #1055
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

addon.gypi

@@ -18,7 +18,10 @@
     'include_dirs': [
       '<(node_root_dir)/include/node',
       '<(node_root_dir)/src',
+      '<(node_root_dir)/deps/openssl/config',
+      '<(node_root_dir)/deps/openssl/openssl/include',
       '<(node_root_dir)/deps/uv/include',
+      '<(node_root_dir)/deps/zlib',
       '<(node_root_dir)/<(node_engine_include_dir)'
     ],
     'defines!': [