Add needed header checks, clean up unused ones. See #1887

utils.cc

@@ -134,7 +134,13 @@
 #include "nmap_error.h"
 #include "NmapOps.h"
 
+#include <sys/types.h>
+#if HAVE_SYS_STAT_H
+#include <sys/stat.h>
+#endif
+#if HAVE_FCNTL_H
 #include <fcntl.h>
+#endif
 #include <errno.h>
 
 extern NmapOps o;