Notes for cp2k - reproducible builds result

Version annotated: 2.6.1-2
Comments: Embeds the build date and hostname.
https://sources.debian.net/src/cp2k/latest/makefiles/Makefile/#L429-L433
.
Part of patch is https://gist.github.com/lamby/f73b5ada8dd849518671fd532d73d4ee/raw
.
docs partly use this value, but also party use "current-dateTime()" from
some XLST library.
 

Our notes about issues affecting packages are stored in notes.git and are targeted at packages in Debian in 'unstable/amd64' (unless they say otherwise).