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

[JMK]

Perhaps this way is much better...

IN «source/CMakeLists.txt»:

# ************************************************************************
if(WIN32)
   if(NOT MINGW)
      # Visual leak detector
      find_package(VLD QUIET)
      if(VLD_FOUND)
         add_definitions(-DHAVE_VLD)
         include_directories(${VLD_INCLUDE_DIRS})
         set(PLATFORM_LIBS ${PLATFORM_LIBS} ${VLD_LIBRARIES})
         link_directories(${VLD_LIBRARY_DIRS})
      endif()
      option(WINXP_SUPPORT "Make binaries compatible with Windows XP" OFF)
      if(WINXP_SUPPORT)
         # force use of workarounds for CONDITION_VARIABLE and atomic
         # intrinsics introduced after XP
         add_definitions(-D_WIN32_WINNT=_WIN32_WINNT_WINXP)
      endif()
   endif()
   if(MINGW)
      if(X86 AND NOT X64)
         add_definitions(-D_WIN32_WINNT=_WIN32_WINNT_WINXP)
      elseif(X64)
         add_definitions(-D_WIN32_WINNT=_WIN32_WINNT_VISTA)
      endif()
   endif()
endif()
# ************************************************************************

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