HDF 4.3.0

[Sebastiaan Couwenberg <sebastic@xs4all.nl>]

HDF 4.3.0 has been released which no longer installs several private 
headers and stops exporting private symbols, see:


https://github.com/HDFGroup/hdf4/blob/hdf4.3.0/doc/HDF-4.2-to-4.3-migration.md

The new release does not bump the SONAME, despite these potentially 
breaking changes.

The find out whether we can move HDF 4.3.0 without breaking too many 
rdeps, I did a round of rebuilds which revealed that 7 of 14 rdeps FTBFS 
although only 3 due to these changes in HDF 4.3.0.

-Werror=implicit-function-declaration is the most common FTBFS cause.

I've requested the removal of librsl because it's RC buggy since 2018 
with no activity of its maintainer since 2014. Let's not waste time on 
this package in the future.

Our only affected package is python-hdf4, which already has a patch in 
git. Two other packages have patches in the BTS, see:


https://bugs.debian.org/cgi-bin/pkgreport.cgi?users=debian-gis@lists.debian.org&tag=hdf-4.3

Since there were no major blockers, I'll move the package to unstable 
soon. I'll wait for the experimental build on riscv64 and and give debci 
a chance to run its jobs for the rdeps with the package from experimental.

Kind Regards,

Bas

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