New issue by datenwolf on void-packages repository

https://github.com/void-linux/void-packages/issues/32788

Description:

### System

* xuname:  Void 5.13.13_1 x86_64 GenuineIntel notuptodate rrrrrmmdnFFFFF
* package:  mesa-dri-dbg-21.2.1_1

### Expected behavior
mesa-dri-dbg should contain debug information for all shared objects shipped in mesa-dri

### Actual behavior
mesa-dri-dbg contains only a subset of debug files:

```
~/ %  xbps-query -f mesa-dri
/usr/lib/dri/crocus_dri.so
/usr/lib/dri/i830_dri.so
/usr/lib/dri/i915_dri.so
/usr/lib/dri/i965_dri.so
/usr/lib/dri/iris_dri.so
/usr/lib/dri/kms_swrast_dri.so
/usr/lib/dri/libgallium_dri.so
/usr/lib/dri/libmesa_dri_drivers.so
/usr/lib/dri/nouveau_dri.so
/usr/lib/dri/nouveau_vieux_dri.so
/usr/lib/dri/r200_dri.so
/usr/lib/dri/r300_dri.so
/usr/lib/dri/r600_dri.so
/usr/lib/dri/radeon_dri.so
/usr/lib/dri/radeonsi_dri.so
/usr/lib/dri/swrast_dri.so
/usr/lib/dri/virtio_gpu_dri.so
/usr/lib/dri/vmwgfx_dri.so
/usr/lib/dri/zink_dri.so
/usr/lib/gallium-pipe/pipe_crocus.so
/usr/lib/gallium-pipe/pipe_iris.so
/usr/lib/gallium-pipe/pipe_nouveau.so
/usr/lib/gallium-pipe/pipe_r300.so
/usr/lib/gallium-pipe/pipe_r600.so
/usr/lib/gallium-pipe/pipe_radeonsi.so
/usr/lib/gallium-pipe/pipe_swrast.so
/usr/lib/gallium-pipe/pipe_vmwgfx.so

~/ %  xbps-query -f mesa-dri-dbg
/usr/lib/debug/usr/lib/dri/libgallium_dri.so
/usr/lib/debug/usr/lib/dri/libmesa_dri_drivers.so
/usr/lib/debug/usr/lib/gallium-pipe/pipe_crocus.so
/usr/lib/debug/usr/lib/gallium-pipe/pipe_iris.so
/usr/lib/debug/usr/lib/gallium-pipe/pipe_nouveau.so
/usr/lib/debug/usr/lib/gallium-pipe/pipe_r300.so
/usr/lib/debug/usr/lib/gallium-pipe/pipe_r600.so
/usr/lib/debug/usr/lib/gallium-pipe/pipe_radeonsi.so
/usr/lib/debug/usr/lib/gallium-pipe/pipe_swrast.so
/usr/lib/debug/usr/lib/gallium-pipe/pipe_vmwgfx.so
```

### Steps to reproduce the behavior
Install mesa-dri and mesa-dri-dbg and compare their set of files.