Allow std::ignore in split()
Summary:
This allows a caller to throw away unwanted parts e.g.
```
std::string user;
folly::split('/', "ads_lla/admarket/adfox", std::ignore, user, std::ignore);
```
Reviewed By: yfeldblum
Differential Revision: D10057247
fbshipit-source-id: 8198d4cb207bbd2007635db1e5796759dccf367c
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