Fix if() checks of CMAKE_SYSTEM_NAME on Cygwin
The CMAKE_SYSTEM_NAME is "CYGWIN", but we also define a variable named "CYGWIN" to "1". Avoid allowing if() to expand the "CYGWIN" string as a variable.
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The CMAKE_SYSTEM_NAME is "CYGWIN", but we also define a variable named "CYGWIN" to "1". Avoid allowing if() to expand the "CYGWIN" string as a variable.