The flexible design already allowed to add these flags trivially.
Drop the -I and -L-flags, which are XSI-extensions.
The audit generally consisted of style-changes, dropping kitchen-
sink functions, updating the usage and using estrtonum instead of
strtol.
*sum tools: -c was added
tr: -d flag was added.
xargs: -n flag was added.
cmp: minor typo (change to lowercase).
Signed-off-by: Hiltjo Posthuma <hiltjo@codemadness.org>
