Allow 3705 devices with statically linked Hercules

[PeterCoghlan]

Adding entries for 3705 devices to hdlmain.c and devtype.h allows these devices to be used when Hercules is statically linked. However, this results in a linker warning that symbol get_inet_socket() is multiply defined (in comm3705.c and in console.c). However, get_inet_socket() is not called in comm3705.c and it is also surrounded by #if 1 / #endif so it seems reasonable to change this #if 1 to #if 0 in comm3705.c.