[PATCH] [libc++] Support Newlib as libc++'s C library [locale part 2]

[Jonathan Roelofs]

Hi jfb, danalbert,

Give newlocale/freelocale/duplocale/uselocale something closer to how the real ones would behave, fixing failures like:

```
terminating with uncaught exception of type std::runtime_error: collate_byname<char>::collate_byname failed to construct for C
```
in tests like:

```
localization/locales/locale/locale.statics/classic.pass.cpp
```

http://reviews.llvm.org/D5418

Files:
  include/support/newlib/xlocale.h
  src/support/newlib/xlocale.cpp
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