Fixed "declaration shadows global declaration" warnings.

Fixed "declaration shadows global declaration" warnings.

The patch simply uses a more descriptive variable name for tcp_seq.

../lib/socket_wrapper/socket_wrapper.c:753: warning: declaration of 'tcp_seq' shadows a global declaration
/usr/include/netinet/tcp.h:40: warning: shadowed declaration is here
../lib/socket_wrapper/socket_wrapper.c: In function `swrap_marshall_packet':
../lib/socket_wrapper/socket_wrapper.c:919: warning: declaration of 'tcp_seq' shadows a global declaration
/usr/include/netinet/tcp.h:40: warning: shadowed declaration is here