Notes for netsurf - reproducible builds result

Version annotated: 3.2+dfsg-2
Identified issues:
Identifier: timestamps_in_png
Description PNG can capture build time with the tIME chunk or custom keywords.
These timestamps are currently removed by strip-nondeterminism, so are not visible to diffoscope anymore. Yet fixing the root cause would be nice.

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).