There is a new pull request by JamiKettunen against master on the void-packages repository

https://github.com/JamiKettunen/void-packages liblightdm-qt5-cross
https://github.com/void-linux/void-packages/pull/40256

lightdm: enable cross-build of liblightdm-qt5
This was excluded way back in Qt4 days of early 2015 to enable cross-building of `lightdm` but doesn't appear to be a problem anymore.

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#### Testing the changes
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A patch file from https://github.com/void-linux/void-packages/pull/40256.patch is attached