fix typo

demo/minimum_example/CMakeLists.txt

@@ -52,7 +52,7 @@ target_link_libraries(minimum_example ${MINIMUM_EXAMPLE_LIBRARIES})
 if ( NOT WIN32 )
   # Set compiler flags
   if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
-    set_target_properties(minimum_example PROPERTIES COMPILE_FLAGS "s-Wno-long-long")
+    set_target_properties(minimum_example PROPERTIES COMPILE_FLAGS "-Wno-long-long")
   else()
     set_target_properties(minimum_example PROPERTIES COMPILE_FLAGS "-pedantic -Wno-long-long")
   endif()