gyp: fix for non-acsii userprofile name on Windows

Squashed commit of the following:

commit 9f3a1b2
Author: João Henriques <[email protected]>
Date:   Tue Dec 17 21:14:18 2013 +0000

    Update easy_xml.py

    Better handling of encoding

commit a8b4942
Author: João Henriques <[email protected]>
Date:   Thu Dec 12 04:09:38 2013 +0000

    Quick and dirty fix to allow WriteXmlIfChanged to write xml in utf-8, converting latin-1 directory paths.

Closes #366.
Closes #554.
Fixes #297.
Fixes #404.
Fixes #476.

Author: jfhenriques

gyp/pylib/gyp/easy_xml.py

@@ -115,6 +115,11 @@ def WriteXmlIfChanged(content, path, encoding='utf-8', pretty=False,
   xml_string = XmlToString(content, encoding, pretty)
   if win32 and os.linesep != '\r\n':
     xml_string = xml_string.replace('\n', '\r\n')
+    
+  try:
+    xml_string = xml_string.encode(encoding)
+  except Exception:
+    xml_string = unicode(xml_string, 'latin-1').encode(encoding)
 
   # Get the old content
   try: