Dockerfile: Update building trace tools slightly

Dockerfile: Update building trace tools slightly

We have not been picking a tag for the trace-cmd build process.
Currently the tip of libtraceevent fails to build. Address both problems
here by picking recent stable tags for libtraceevent and libtracefs
(trace-cmd has no recent tags). Further, as it is often reported that
this fails to build due to a race, stop using "make -j$(nproc)" as this
is also small enough of a set of builds to not be an issue.

Signed-off-by: Tom Rini <trini@konsulko.com>