Mario Liebisch ba9383f25e Updated/fixed string comparisons in Config.cmake
SFML so far used `${CMAKE_SYSTEM_NAME} MATCHES "Windows"`. This works, but only because there's a variable `WINDOWS` having the exact same content (`Windows`).

[More information and a similar issue can be found in this SO thread.](http://stackoverflow.com/questions/21995777/cygwins-cmake-does-not-match-for-cmake-system-name)
2016-07-17 20:13:14 +02:00
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