[PATCH] Add writeFileWithSystemEncoding to LibLLVMSupport

[Rafael Auler]

Added the struct "EncodingStrategy", used to represent how the user wants to encode her file in different OSes. This was used to allow the removal of several ifdefs in the clang side of the patch at 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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