[PATCH 2/7] support: Add missing NSS formatting and checking functions

[DJ Delorie]

I realize this patch completes a set of previously existing functions,
but do we need to have one file per function for support functions?  We
only ever use them in test cases, and we generally aren't that worried
about the code size for test cases.  We *are* worried about build/test
times, and having fewer source files to process should help build times.