Fixes #2272, typo in CMakeLists.txt (thanks Boris Bendovsky!)

CMakeLists.txt

@@ -829,7 +829,7 @@ elseif(WINDOWS)
 
   if(SDL_FILESYSTEM)
     set(SDL_FILESYSTEM_WINDOWS 1)
-    file(GLOB FILESYSTEM_SOURCES ${SDL2_SOURCE_DIR}/src/filesytem/windows/*.c)
+    file(GLOB FILESYSTEM_SOURCES ${SDL2_SOURCE_DIR}/src/filesystem/windows/*.c)
     set(SOURCE_FILES ${SOURCE_FILES} ${FILESYSTEM_SOURCES})
     set(HAVE_SDL_FILESYSTEM TRUE)
   endif(SDL_FILESYSTEM)