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

lib/libpuffs/puffs.c

@@ -767,7 +767,7 @@ static void reply(
   message *m_out                       	/* report result */
 )
 {
-  if (OK != send(who, m_out))    /* send the message */
+  if (OK != ipc_send(who, m_out))    /* send the message */
 	lpuffs_debug("libpuffs(%d) was unable to send reply\n", sef_self());
 
   last_request_transid = 0;