Restore headers in nsock error.h

These includes seem useless and nsock and nmap happily compile w/o them but the
nsock test suite doesn't. Temporarily restore them to their pre-r36100 state
until I can clean and streamline the inclusion tree.

nsock/src/error.h

@@ -59,7 +59,22 @@
 #ifndef ERROR_H
 #define ERROR_H
 
-#include "nbase.h"
+#ifdef HAVE_CONFIG_H
+#include "nsock_config.h"
+#include "nbase_config.h"
+#endif
+
+#ifdef WIN32
+#include "nbase_winconfig.h"
+#endif
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#if HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
 
 void fatal(char *fmt, ...)
   __attribute__ ((noreturn))