sclose() function-like macro definition used to close a socket,

now solely based on HAVE_CLOSESOCKET and HAVE_CLOSESOCKET_CAMEL
config file preprocessor definitions.

lib/setup_once.h

@@ -229,6 +229,19 @@ struct timeval {
 #endif /* if 0 */
 
 
+/*
+ * Function-like macro definition used to close a socket.
+ */
+
+#if defined(HAVE_CLOSESOCKET)
+#  define sclose(x)  closesocket((x))
+#elif defined(HAVE_CLOSESOCKET_CAMEL)
+#  define sclose(x)  CloseSocket((x))
+#else
+#  define sclose(x)  close((x))
+#endif
+
+
 /*
  * Uppercase macro versions of ANSI/ISO is*() functions/macros which
  * avoid negative number inputs with argument byte codes > 127.