Bug#928037: mailcap(5): please document security considerations about %-escapes

[Marriott NZ]

About the MAILCAP/MAILCAPS issue: mutt uses MAILCAPS too (I did check the 
manual before, but not the man page).
Now I tend to think that this is just another gnu mailutils bug and the common 
practice is to follow the RFC (MAILCAPS), sorry for the noise.