Checksums point to trac server #35014
Description
The following four checksums are hosted on the Sage trac server as an attachment, and should probably move:
build/pkgs/giac/checksums.ini:upstream_url=https://trac.sagemath.org/raw-attachment/ticket/31563/giac-VERSION.tar.bz2
build/pkgs/iml/checksums.ini:upstream_url=https://trac.sagemath.org/raw-attachment/ticket/33195/iml-1.0.4p2.tar.bz2
build/pkgs/mathjax/checksums.ini:upstream_url=https://trac.sagemath.org/raw-attachment/ticket/25833/mathjax-3.2.0.tar.gz
build/pkgs/msolve/checksums.ini:upstream_url=https://trac.sagemath.org/raw-attachment/ticket/31664/msolve-VERSION.tar.gz