lib/stdsoap2.c: Added GSOAP library source file

This file has a few modifications that extends the functionalities of GSOAP
library to allow the client to bind to a specific network interface,
before connecting to the server.

It uses the "device" variable added in the header file to check if the
client wants to bind to a network device. If not NULL, it gets the address
of the NIC whose name is the value of "device" variable inside the soap
struct, and binds the socket to the interface.

This happens inside tcp_connect().

Also, "device" is desallocated if not NULL, inside soap_done().

Signed-off-by: Erik Alexandre Pucci <eap08@c3sl.ufpr.br>
Acked-by: Ricardo Tavares de Oliveira <rto07@c3sl.ufpr.br>
Signed-off-by: Danilo K. S. Yorinori <danilok@c3sl.ufpr.br>