libtracecmd: Rewrite Makefile for Documentation directory

The installation for libtracecmd documents was not working properly. The
libtracefs Documentation Makefile was copied over and modified for
libtracecmd. It was also updated to show each file being installed, and the
dependencies were fixed to not recreate the man pages every time it was
built.

Link: https://lore.kernel.org/linux-trace-devel/20210325152208.3440b3ad@gandalf.local.home

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
13 files changed