build(linux): generate glad sources at compile time (#4798)

Co-authored-by: Conn O'Griofa <connogriofa@gmail.com>

.github/workflows/ci-linux.yml

@@ -58,12 +58,6 @@ jobs:
             libxcb-dri3-dev \
             libxfixes-dev
 
-      - name: Setup python
-        id: python
-        uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
-        with:
-          python-version: '3.14'
-
       - name: Build latest libva
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
@@ -163,6 +157,12 @@ jobs:
           sudo apt-get clean
           sudo rm -rf /var/lib/apt/lists/*
 
+      - name: Setup python
+        id: python
+        uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
+        with:
+          python-version: '3.14'
+
       - name: Run tests
         id: test
         working-directory: build/tests
@@ -181,7 +181,7 @@ jobs:
           (steps.test.outcome == 'success' || steps.test.outcome == 'failure')
         working-directory: build
         run: |
-          ${{ steps.python.outputs.python-path }} -m pip install "../scripts[test]"
+          ${{ steps.python.outputs.python-path }} -m pip install "..[test]"
           ${{ steps.python.outputs.python-path }} -m gcovr --gcov-executable "gcov-${GCC_VERSION}" . -r ../src \
             --exclude-noncode-lines \
             --exclude-throw-branches \