[PATCH] [libcxxabi] Fix -Werror build for 32-bit non-ARM.

[Dan Albert]

Hi jroelofs, thakis,

The inclusion of Unwind-EHABI.h was insufficiently guarded
(LIBCXXABI_ARM_EHABI was beign checked without ever being defined).

Move the check into the header file itself, add the check to the
source file, and clean up the existing checks.

LIBCXXABI_ARM_EHABI didn't have a canonical defintion; it was
duplicated across cxxabi.h, libunwind.h, and unwind.h. Move the
definition into __cxxabi_config.h and clean up the old cruft (note: we
will have to ship this header).

There are also a few drive-by formatting/whitespace cleanups.

http://reviews.llvm.org/D7419

Files:
  include/__cxxabi_config.h
  include/cxxabi.h
  include/libunwind.h
  include/unwind.h
  src/Unwind/Unwind-EHABI.cpp
  src/Unwind/Unwind-EHABI.h
  src/Unwind/UnwindCursor.hpp
  src/Unwind/UnwindLevel1-gcc-ext.c
  src/cxa_exception.cpp
  src/cxa_exception.hpp

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