Add libudev/virtual

[Croydon]

Specify library name and version: libudev/virtual

• I've read the guidelines for contributing.
• 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.

---

This is a "virtual" package. It uses a system package manager to actually install libudev.

For more context see conan-io/hooks#158
It also depends on conan-io/hooks#158

[conan-center-bot]

All green in build 1 (3b44d90b4c0e4242b22ee1271d7b306430828b8f)! 😊

• libudev/virtual: Generated 1 packages. All logs here

[conan-center-bot]

Some configurations of 'libudev/virtual' failed in build 2 (2fd2494b66e34f10790616118f345bf0ff10be93):

• Linux x86_64, Release, gcc 5, libstdc++
  • Hooks errors detected:
    • [HOOK - conan-center.py] pre_export(): ERROR: [SYSTEM REQUIREMENTS (KB-H032)] The method 'SystemPackageTool.install' is not allowed in the recipe. (https://github.com/conan-io/conan-center-index/wiki/Error-Knowledge-Base#KB-H032)
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[uilianries]

When Conan Devs started to discuss about this possibility, they called "Proxy Package" actually.

/cc @czoido @danimtb @SSE4

[conan-center-bot]

Some configurations of 'libudev/virtual' failed in build 3 (3f72f3e7088275d02d9494c854d56661b478ba56):

• Linux x86_64, Release, gcc 5, libstdc++
  • Hooks errors detected:
    • [HOOK - conan-center.py] pre_source(): ERROR: [IMMUTABLE SOURCES (KB-H010)] Create a file 'conandata.yml' file with the sources to be downloaded. (https://github.com/conan-io/conan-center-index/wiki/Error-Knowledge-Base#KB-H010)
    • [HOOK - conan-center.py] pre_source(): ERROR: [IMMUTABLE SOURCES (KB-H010)] Use 'tools.get(**self.conan_data["sources"]["XXXXX"])' in the source() method to get the sources. (https://github.com/conan-io/conan-center-index/wiki/Error-Knowledge-Base#KB-H010)
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[conan-center-bot]

Some configurations of 'libudev/virtual' failed in build 4 (3f72f3e7088275d02d9494c854d56661b478ba56):

• Linux x86_64, Release, gcc 5, libstdc++
  • Hooks errors detected:
    • [HOOK - conan-center.py] pre_source(): ERROR: [IMMUTABLE SOURCES (KB-H010)] Create a file 'conandata.yml' file with the sources to be downloaded. (https://github.com/conan-io/conan-center-index/wiki/Error-Knowledge-Base#KB-H010)
    • [HOOK - conan-center.py] pre_source(): ERROR: [IMMUTABLE SOURCES (KB-H010)] Use 'tools.get(**self.conan_data["sources"]["XXXXX"])' in the source() method to get the sources. (https://github.com/conan-io/conan-center-index/wiki/Error-Knowledge-Base#KB-H010)
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[madebr]

How will virtual packages handle different versions of packages?
Should there exist a way to check the installed version and communicate this to consumers?

Should consumers be able to add the following requirement? libudev/virtual[>245] (or something similar)

[Croydon]

Closing in favour of #2468