[x265] MinGW: 64-bits vs. XP compatibility

[JMK]

A humble suggestion -- for the file "source\CMakeLists.txt":

# *************************
if(WIN32)
  option(WINXP_SUPPORT "Make binaries compatible with Windows XP" OFF)
    if(MINGW)
      if(X64)
        add_definitions(-D_WIN32_WINNT=_WIN32_WINNT_VISTA)
      endif(X64)
    endif(MINGW)
  if(WINXP_SUPPORT)
    add_definitions(-D_WIN32_WINNT=_WIN32_WINNT_WINXP)
  endif()
endif()
# *************************

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