xkbcommon: Use rm_safe from Conan 1.53 and simplify test package

[jwillikers]

Fix cmake_layout import.

Specify library name and version: lib/1.0

This is also a good place to share with all of us why you are submitting this PR (specially if it is a new addition to ConanCenter): is it a dependency of other libraries you want to package? Are you the author of the library? Thanks!

---

• I've read the contributing guidelines.
• I've followed the PEP8 style guides for Python code in the recipes.
• I've used the latest Conan client version.
• I've tried at least one configuration locally with the conan-center hook activated.

[conan-center-bot]

Conan v1 pipeline

All green in build 2 (3032e3ea9034c4162e6d0c4801fb7c1915ee9b0a):

• xkbcommon/1.4.0@:
  All packages built successfully! (All logs)

• xkbcommon/1.4.1@:
  All packages built successfully! (All logs)

• xkbcommon/1.3.0@:
  All packages built successfully! (All logs)

• xkbcommon/1.3.1@:
  All packages built successfully! (All logs)

• xkbcommon/1.2.1@:
  All packages built successfully! (All logs)

• xkbcommon/1.1.0@:
  All packages built successfully! (All logs)

• xkbcommon/1.0.3@:
  All packages built successfully! (All logs)

• xkbcommon/0.10.0@:
  All packages built successfully! (All logs)

• xkbcommon/1.0.1@:
  All packages built successfully! (All logs)

[uilianries]

LGTM