skiboot/libmctp/ is a minimally modified version of upstream libmctp
that is distributed with the openbmc project hosted at
https://github.com/openbmc/libmctp.git

This version is taken from libmctp.git commit 4df106db7766d ("astlpc: Add
mctp_astlpc_tx_done() API") by copying most
of files from the libmctp/ directory.

The only modifications from the upstream source are the additions of
this file, Makefile.inc which has been derived from the original
Makefile.inc, astlpc.c (compilation error when MCTP_HAVE_FILEIO is
undefined) and the removal of several unnecessary folders and files.

Local libmctp changes should be kept to a minimum, and submitted
upstream if possible.