Some sys_net functions

* sys_net; Added some functions using winsock.h | sys/socket.h
* sys_net: Renamed overloaded function/structs "*" to "sys_net_*"
* Added SetAddr function to mem_base_t

rpcs3/Emu/SysCalls/Modules/sys_net.h

@@ -0,0 +1,16 @@
+#pragma once
+
+struct sys_net_initialize_parameter
+{
+	u32 memory_addr;
+	int memory_size;
+	int flags;
+};
+
+// The names of the following structs are modified to avoid overloading problems
+struct sys_net_sockaddr
+{
+	u8 sa_len;
+	u8 sa_family; // sa_family_t
+	u8 sa_data[14];
+};