revert StdInc include in BuildAnalyzer.cpp which was reported by CLion as unused

AI/Nullkiller2/Analyzers/BuildAnalyzer.cpp

@@ -7,6 +7,7 @@
 * Full text of license available in license.txt file, in main folder
 *
 */
+#include "../StdInc.h"
 #include <boost/range/algorithm/sort.hpp>
 
 #include "../Engine/Nullkiller.h"