[PATCH] Add writeFileWithSystemEncoding to LibLLVMSupport

[Rafael Auler]

Implemented rnk's and rafael's suggestions. Will update the clang part to D4897.

http://reviews.llvm.org/D4896

Files:
  include/llvm/Support/Program.h
  lib/Support/Unix/Program.inc
  lib/Support/Windows/Path.inc
  lib/Support/Windows/Program.inc
  lib/Support/Windows/WindowsSupport.h
  unittests/Support/ProgramTest.cpp
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