BLD: Pre-download Qhull license to put in wheels

We couldn't work out what exactly changed to stop the license being
included, so work around that by pre-downloading it.

Fixes matplotlib#25212

Author: QuLogic

.github/workflows/cibuildwheel.yml

@@ -61,6 +61,14 @@ jobs:
         with:
           fetch-depth: 0
 
+      # Something changed somewhere that prevents the downloaded-at-build-time
+      # licenses from being included in built wheels, so pre-download them so
+      # that they exist before the build and are included.
+      - name: Pre-download bundled licenses
+        run: >
+          curl -Lo LICENSE/LICENSE_QHULL
+          https://github.com/qhull/qhull/raw/2020.2/COPYING.txt
+
       - name: Build wheels for CPython 3.11
         uses: pypa/[email protected]
         env: