[Inet] Fix setting for O_CLOEXEC

The macro O_CLOEXEC is a filedescriptor flag.

The implemention sets the flag O_CLOEXEC as the parameter command given
to function fcntl[1] and causes the call to fcntl to return -1 with
EINVAL.

The flag O_CLOEXEC intends to be set using the command F_SETFD.

This fixes the behaviour by adding the missing command paramete F_SETFD
before the optional argument O_CLOEXEC.

[1]: https://man7.org/linux/man-pages/man2/fcntl.2.html

src/inet/InetInterface.cpp

@@ -505,7 +505,7 @@ int GetIOCTLSocket()
 #endif
         {
             s = socket(AF_INET, SOCK_STREAM, 0);
-            fcntl(s, O_CLOEXEC);
+            fcntl(s, F_SETFD, O_CLOEXEC);
         }
 
         if (!__sync_bool_compare_and_swap(&sIOCTLSocket, -1, s))