Bug#351874: vim-common: [SYNTAX] please allow printf %zd format for size_t

[Justin Pryzby]

Package: vim-common
Version: 1:6.4-006+1

vim doesn't highlight the C printf format string %zd in purple as it
does other formats like %d and \n.

Also, I see: bdiuoxXDOUfeEgGcCsSpn

I don't know where 'b' comes from, and 'F' seems to be missing.  Maybe
this is conditional on different C variants.  I don't see where 'z'
should go, so I'm not going to attempt to provide a patch..