Adding ipc_ prefix to ipc primitives

* Also change _orig to _intr for clarity
 * Cleaned up {IPC,KER}VEC
 * Renamed _minix_kernel_info_struct to get_minix_kerninfo
 * Merged _senda.S into _ipc.S
 * Moved into separate files get_minix_kerninfo and _do_kernel_call
 * Adapted do_kernel_call to follow same _ convention as ipc functions
 * Drop patches in libc/net/send.c and libc/include/namespace.h

Change-Id: If4ea21ecb65435170d7d87de6c826328e84c18d0

servers/ipc/main.c

@@ -99,7 +99,7 @@ int main(int argc, char *argv[])
 					printf("IPC: error for %d: %d\n",
 						call_type, result);
 
-				if ((r = sendnb(who_e, &m)) != OK)
+				if ((r = ipc_sendnb(who_e, &m)) != OK)
 					printf("IPC send error %d.\n", r);
 			}
 		} else {

servers/ipc/sem.c

@@ -103,7 +103,7 @@ static void send_message_to_process(endpoint_t who, int ret, int ignore)
 	message m;
 
 	m.m_type = ret;
-	sendnb(who, &m);
+	ipc_sendnb(who, &m);
 }
 
 static void remove_semaphore(struct sem_struct *sem)
@@ -576,7 +576,7 @@ out:
 	if (r != OK || !no_reply) {
 		m->m_type = r;
 
-		sendnb(who_e, m);
+		ipc_sendnb(who_e, m);
 	}
 
 	/* awaken process if possible */