update source url of expat library from sourceforge to github #53
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expat library moved location from sourceforge to github. Even downloads were still available on sourceforge, it seems it's not reliable source anymore.
For example I am not able to download it now, and more people as well in a recent history (see pfalcon/esp-open-sdk#307 ):
Since it's not reliable to use sourceforge, I've update source to github in a recipe.