Fix include order

Author: joto

examples/osmium_dump_internal.cpp

@@ -33,9 +33,9 @@
 #include <exception>
 #include <iostream>    // for std::cout, std::cerr
 #include <string>      // for std::string
-#include <system_error>
 #include <sys/stat.h>  // for open
 #include <sys/types.h> // for open
+#include <system_error>
 
 #ifdef _WIN32
 # include <io.h>       // for _setmode