Merge branch 'sk/mingw-uni-fix-more'

Most of these are battle-tested in msysgit and are needed to
complete what has been merged to 'master' already.

* sk/mingw-uni-fix-more:
  Win32: enable color output in Windows cmd.exe
  Win32: patch Windows environment on startup
  Win32: keep the environment sorted
  Win32: use low-level memory allocation during initialization
  Win32: reduce environment array reallocations
  Win32: don't copy the environment twice when spawning child processes
  Win32: factor out environment block creation
  Win32: unify environment function names
  Win32: unify environment case-sensitivity
  Win32: fix environment memory leaks
  Win32: Unicode environment (incoming)
  Win32: Unicode environment (outgoing)
  Revert "Windows: teach getenv to do a case-sensitive search"
  tests: do not pass iso8859-1 encoded parameter

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