Without that fix we have:
    host C++: llvm-tblgen <= external/llvm/utils/TableGen/AsmWriterInst.cpp
    In file included from external/llvm/utils/TableGen/AsmMatcherEmitter.cpp:117:
    In file included from external/libcxx/include/sstream:174:
    In file included from external/libcxx/include/ostream:138:
    In file included from external/libcxx/include/ios:216:
    external/libcxx/include/__locale:39:11: fatal error: 'xlocale.h' file not found
    # include <xlocale.h>
          ^

Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>

Bug: 18471342
Bug: 19958712
This reverts commit d3c786591b2e606d371c402bb3123fffbcbbb6ba.

Change-Id: Ie0744c329241cf20b58c519c1bbbdc68e496e43d
(cherry picked from commit 2ea633775bea94317c426da71f3782ce322389fd)

* commit '5b4618897e6e6fda29600d66a74d0f3f1024338a':
  Fix LD_LIBRARY_PATH for host tests after update.

* commit '4325b239b22e56200a53719b28e0207c00240acc':
  Fix output directory for host tests.

* commit '5d7b6dffa41dffb6e80e91041bbd4e8fd759c4a1':
  Use libgcc unwinder for non-ARM targets.

* commit '15d0bc57253f8e586fe1f52d359c753e7e01dc67':
  Fix LD_LIBRARY_PATH for host tests after update.

* commit '3a29e8f9d37a95e5154af33d159918e624def323':
  Fix output directory for host tests.

* commit 'a3287786b567a1fff1ed0d440321d6b0e0c0c045':
  Use libgcc unwinder for non-ARM targets.