build-support/php: fix comments in multi-lines command

Author: drupol

pkgs/build-support/php/builders/v2/hooks/composer-vendor-hook.sh

@@ -60,10 +60,10 @@ composerVendorBuildHook() {
     echo "Executing composerVendorBuildHook"
 
     composer \
-        # The acpu-autoloader is not reproducible and has to be disabled.
-        # Upstream PR: https://github.com/composer/composer/pull/12090
-        # --apcu-autoloader \
-        # --apcu-autoloader-prefix="$(jq -r -c 'try ."content-hash"' < composer.lock)" \
+        `# The acpu-autoloader is not reproducible and has to be disabled.` \
+        `# Upstream PR: https://github.com/composer/composer/pull/12090` \
+        `# --apcu-autoloader` \
+        `# --apcu-autoloader-prefix="$(jq -r -c 'try ."content-hash"' < composer.lock)"` \
         --no-interaction \
         --no-progress \
         --optimize-autoloader \