Update install.sh

[ppfloydde]

Add export PKG_CONFIG_PATH for libinput

Pull Request

Description

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• Try to include a summary of the changes and which issue is fixed.
• Also include relevant motivation and context (if applicable).
• List any dependencies that are required for this change. (e.g., packages or other PRs)
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Type of change

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update (non-breaking change; modified files are limited to the documentations)
• Technical debt (a code change that does not fix a bug or add a feature but makes something clearer for devs)
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Checklist

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• I have read the CONTRIBUTING document.
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• My commit message follows the commit guidelines.
• My change requires a change to the documentation.
• I want to add something in Debian-Hyprland wiki.
• I have added tests to cover my changes.
• I have tested my code locally and it works as expected.
• All new and existing tests passed.

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Additional context

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