cmake: detect Cygwin which needs extensions to build
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@ -8,8 +8,10 @@ if (CMAKE_VERSION VERSION_LESS "3.1")
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else()
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set(CMAKE_CXX_STANDARD 11)
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set(CMAKE_CXX_STANDARD_REQUIRED ON)
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if(NOT CYGWIN)
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set(CMAKE_CXX_EXTENSIONS OFF)
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endif()
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endif()
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if (POLICY CMP0048)
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cmake_policy(SET CMP0048 NEW)
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