New package: contour-0.4.0.6245

[0x5c]

Fixes #34513

libunicode provides a tool, currently packaged in -devel, should it be somewhere else? It's a simple tool that provides info on characters passed as argument. With feedback, the tool is now left in the main package.

I'm also not a fan of the way I have to download the Unicode UCD archive manually. The linunicode build system tries to do it, but it fails locally in xbps-src. While having it as a distfile is still a but annoying, it's way less clunky.

Testing the changes

• I tested the changes in this PR: YES

New package

• This new package conforms to the package requirements: YES

[0x5c]

Inventory of failure:

• cross archs: build tool is compiled for target [libunicode & contour]
  → build_helper=qemu is made of 🪄 Magic ✨
• i686 (glibc) 32bit archs: c++ intrinsics sadness [libunicode]
  → Upstream says it's not supported (yet), marking broken
• x86_64-musl (all-musl?): pthread sadness [contour]
  → in musl land, you don't get a thread name
• aarch64: ??? [contour]
  → qt6-base qt6-tools in hostmakedepends, duh