PATCH: (kind of) to improve support for libc++ with libsupc++

[Chandler Carruth]

It appears that there is file in libc++ whose entire contents are provided
by libc++abi / libcxxrt / libsupc++:

src/typeinfo.cpp
--------
...
#if !(defined(_LIBCPPABI_VERSION) || defined(LIBCXXRT))
...
#endif
--------

So, only headers are included before the #if. So for users of libc++abi and
libcxxrt, this translation unit is empty.

For users of libsupc++, the symbols defined here produce link errors as
they are always provided by libsupc++.

Any objections to my deleting this file?
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