[PATCH] Add getenv() wrapper that works on multibyte environment variable.

[Rui Ueyama]

  - Moved UTF8ToUTF16 and UTF16ToUTF8 from windows/Path.inc to windows/Windows.h,
    so that we can use these utilities from windows/Process.inc.
  - Removed convertUTF8ToUTF16String from ConvertUTF8Wrapper.cpp.
  - Moved GetEnv() from its own file to Process.cpp.

http://llvm-reviews.chandlerc.com/D1612

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1612?vs=4078&id=4146#toc

Files:
  include/llvm/Support/Process.h
  lib/Support/Unix/Process.inc
  lib/Support/Windows/Path.inc
  lib/Support/Windows/Process.inc
  lib/Support/Windows/Windows.h
  unittests/Support/ProcessTest.cpp
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