The tc program searches LIBDIR by default for the .dist files, and that
defaults to /usr/lib.  But the netem subdir has /lib/ hardcoded which
means the default build+install results in the files not being found.

Further, these are plain text files which are read at runtime, so it
doesn't make sense to give them executable bits.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>