[GNUnet-developers] 2 license headers to fix

[ng0]

I started a new branch with my work on spdx via scripts (there are 
applications, but our use-case
is simple enough to do it with pipes for now).

Odd results upon further expecting grep results:
- src/gns/nss/nss_gns.c  header has not been touched since 2012, exceptions 
2013 and 2015.
   It states that it is parts of nss-gnss. "Parts taken from nss.c in nss-mdns" 
is not very
   specific. Which parts? Have they been changed? Or is it all functions?

- src/util/getopt.c  header should be double checked (typos, indentation, etc).