[misc] Install python2.7

This is to fix a CI error.

It appears that this is from using "ubuntu-latest" in the CI
workflow. It got upgraded to ubuntu 22.04 automatically, and this
doesn't have python2.7 by default.

Author: galv

.github/workflows/c-cpp.yml

@@ -19,6 +19,8 @@ jobs:
     - uses: actions/checkout@v3
     - name: Install sox
       run: sudo apt-get install -y sox intel-mkl
+    - name: Install python2
+      run: sudo apt-get install -y python2
     - name: ccache
       uses: hendrikmuhs/[email protected]
       with: