SNAPCRAFT_PART_INSTALL doesn't expand in build-environment assignments
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Issue body
The following assignment doesn't work:
```yaml
parts:
_part_name_:
build-environment:
- PYTHONPATH: $SNAPCRAFT_PART_INSTALL/lib/python3.6
```
It'll expand to `/lib/python3.6` in the `override-build` scriptlet.
Refer https://forum.snapcraft.io/t/problems-with-the-parts-part-name-build-environment-property/10642 for discussion.
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