r174612 - Documentation: add information about builtin includes to FAQ

[Sean Silva]

+Some header files (``stddef.h``, ``stdard.h``, and others) are shipped with
+Clang --- these are called builtin includes.  Clang searches for them in a
+directory relative to the location of the ``clang`` binary.  If you moved
the
+``clang`` binary, you need to move the builtin headers, too.

What do you think about saying "the clang libraries search for them in a
directory relative to the current executable", so that this FAQ will cover
issues where people run into these errors when using Clang as a library
(which I think is most(?) cases).

-- Sean Silva
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