PATCH] libtracefs: Remove dependency files on make clean

Make clean left behind the dependency files .*.d on make clean, which can
cause havoc when trying to build after doing a checkout to another branch.

Link: https://lore.kernel.org/linux-trace-devel/20211217215841.51753c6a@rorschach.local.home

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>