lib/strutils: add helper function for --annotation option

lib/strutils: add helper function for --annotation option

This function helps evaluates the --annotation option argument
and determines whether annotations are enabled or not.
It is identical to the hyperlinkwanted() routine, and although
that forms some form of redundancy, it is intentionally kept
seperate for potential future changes.

Signed-off-by: Christian Goeschel Ndjomouo <cgoesc2@wgu.edu>