Remove libpkgconf as it seems to be a source of sanitizer errors

.github/workflows/ubuntu.yml

@@ -23,11 +23,7 @@ jobs:
       - name: Install dependencies
         run: |
           sudo apt update
-          sudo apt install gcc-12 libpkgconf-dev libarchive-dev
-
-      - name: Select gcc-12
-        run: |
-          echo "CC=gcc-12" >> $GITHUB_ENV
+          sudo apt install gcc
 
       # Bootstrap basic build.
       - name: Bootstrap