Fix variable expansion?

Author: notroj

.github/workflows/autoconf.yml

@@ -71,9 +71,9 @@ jobs:
           git config --global core.eol lf
 
       - name: Install Apache httpd
-        if: runner.httpd != 'system'
+        if: ${{ matrix.httpd }} != 'system'
         run: |
-          git clone -q --depth=1 -b "${{ runner.httpd }}" https://github.com/apache/httpd
+          git clone -q --depth=1 -b ${{ matrix.httpd }} https://github.com/apache/httpd
           cd httpd
           ./buildconf --with-apr=/usr/bin/apr-1-config
           ./configure --prefix=$HOME/root/httpd --with-mpm=event --enable-dav --enable-dav-fs