[addons] use on build in binary addons only library="dummy.so"

[AlwinEsch]

Description

This is intended to avoid OS related problems when Kodi is built on an unknown OS.

Related to 0833902

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of change

• Bug fix (non-breaking change which fixes an issue)
• Clean up (non-breaking change which removes non-working, unmaintained functionality)
• Improvement (non-breaking change which improves existing functionality)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that will cause existing functionality to change)
• Cosmetic change (non-breaking change that doesn't touch code)
• None of the above (please explain below)

Checklist:

• My code follows the Code Guidelines of this project
• My change requires a change to the documentation, either Doxygen or wiki
• I have updated the documentation accordingly
• I have read the Contributing document
• I have added tests to cover my change
• All new and existing tests passed

[Hitcher]

Above my paygrade unfortunately.

[AlwinEsch]

jenkins build this please

[AlwinEsch]

Why does jenkins not build there?

[Rechi]

Jenkins doesn't build PRs which only change files in addons and a few other folders.

[AlwinEsch]

@Rechi, OK 😄