Comment # 2 on bug 1120488 from Andreas Stieger

The Leap 42.3 portion does not build due to it requiring a newer version of
libuv:
nothing provides pkgconfig(libuv) >= 1.13
1.6.1 is shipped there, this bump in not binary compatible.

The spec change drops the libuv conditional. Consider a submission with only
aria2-CVE-2019-3500.patch added, see
https://build.opensuse.org/request/show/664450