SeaMonkey 2.53.1 was released on 28 February 2020.  We need to produce Leap and
Tumbleweed packages.

This involves fixing at least the following issues:

1) Currently SeaMonkey is reported as building OK with Rust 1.37 but not with
Rust >= 1.40.  Tumbleweed is currently using Rust 1.40 and Leap uses 1.36.  To
get SeaMonkey to build on Tumbleweed, we need to apply the upstream patches
from <https://bugzilla.mozilla.org/show_bug.cgi?id=1617782>.  However, these
patches might not work for Leap.

2) The existing patches that we are applying (for proxies, NTLM, etc.) no
longer apply cleanly.  These need to be checked on a case-by-case basis to see
if they are still necessary, and if so, to adapt them.

I have solved #1 with respect to Tumbleweed in a branch at
<https://build.opensuse.org/package/show/home:psych0naut:branches:mozilla/seamonkey>.

I'm currently working on #2 in the same branch.  The following openSUSE patches
have been successfully adapted:

patch501 - fix declaration of gittid()
patch502 - fix LTO compilation flag