De-duplicate macro _CRT_SECURE_NO_WARNINGS / _CRT_SECURE_NO_DEPRECATE #136
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A downstream project may elect to define macros
_CRT_SECURE_NO_WARNINGS
/_CRT_SECURE_NO_DEPRECATE
using CMake, so Rabit should check existence of these macros before defining them. Otherwise, we'd get a warning about duplicated macros.