Don't install pkgconf

Author: vstinner

.github/workflows/build.yml

@@ -137,7 +137,7 @@ jobs:
       - name: Install Dependencies
         run: |
           sudo ./.github/workflows/posix-deps-apt.sh
-          sudo apt-get -yq install autotools-dev autoconf autoconf-archive pkgconf pkg-config
+          sudo apt-get -yq install autotools-dev autoconf autoconf-archive pkg-config
       - name: Add ccache to PATH
         run: echo "PATH=/usr/lib/ccache:$PATH" >> $GITHUB_ENV
       - name: Configure ccache action