As of March 2020 on most distros libusbx has been replaced by the maintained libusb-1.0.
This reflects the re-merging of the libusbx-project-fork back into the libusb-project (see https://github.com/libusb/libusb/wiki/FAQ#libusborg_libusbxorg_and_libusbinfo) as referenced by @slyshykO in #782. As mentioned in PR #895, I did some small research on this topic to find out about the current state of support by various distributions currently maintained.

Here is the result from https://pkgs.org/search/?q=libusb (as of Mar 2020):

1.0.23

• Alpine Edge
• Alpine 3.11
• ALT Linux Sisyphus
• Arch Linux
• Debian Sid
• Fedora Rawhide --> libusbx, but compatible, as libusb-codebase is used
• KaOS
• OpenMandriva Cooker
• OpenMandriva Lx 4.1
• openSUSE Tumbleweed
• Slackware Current
• Solus
• Ubuntu 20.04 LTS
• Ubuntu 19.10

1.0.22

• Alpine 3.10
• Alpine 3.9
• CentOS 8 --> libusbx, but compatible, as libusb-codebase is used
• Debian 10 (Buster)
• Fedora 31 --> libusbx, but compatible, as libusb-codebase is used
• Fedora 30 --> libusbx, but compatible, as libusb-codebase is used
• Mageia Cauldron
• Mageia 7.1
• NetBSD 9.0
• NetBSD 8.1
• NetBSD 7.2

1.0.21

• CentOS 7 --> libusbx, but compatible, as libusb-codebase is used
• Debian 9 (Stretch)
• openSUSE Leap 15.2
• openSUSE Leap 15.1
• Ubuntu 18.04 LTS

1.0.20

• OpenMandriva Lx 3.0
• Slackware 14.2
• Ubuntu 16.04 LTS

... older libusb versions --> would no longer be supported

• Debian 8 (Jessie) - 1.0.19
• Ubuntu 14.04 LTS - 1.0.17
• CentOS 6 - 1.0.9
• Slackware 14.1 - 1.0.9

Special case
... on FreeBSD libusb is integrated into the system:

• FreeBSD 13 - linux_libusb-13.0r358841 --> libusb-codebase 1.0.16 - 1.0.18 used
• FreeBSD 12 - linux_libusb-11.0r261448_4 --> libusb-codebase 1.0.16 - 1.0.18 used
• FreeBSD 11 - linux_libusb-11.0r261448_4 --> libusb-codebase 1.0.16 - 1.0.18 used

Looking at this, we should set libusb 1.0.20 as the minimum required version (apart from FreeBSD) to ensure widespread compatibility.