The format value has to be a string literal, every time.
Otherwise, you are not using these functions correctly. To reinforce this fact, I putrestrict over every non-contrib example of this I could find.
Previously we needed to include headers required by the various
sudo*h files. Now those files are more self-sufficient and we
should only include headers needed by code in the various .c files.
to use for warn/fatal. If no conversation function is specified,
the standard error will be used. We now only need sudo_printf()
for things that use the parser.
