rework building of shared extensions so that builtin extensions are built at php-src/configure -> make time

src/SPC/builder/extension/rdkafka.php

@@ -27,7 +27,7 @@ class rdkafka extends Extension
         return true;
     }
 
-    public function getConfigureArg(): string
+    public function getConfigureArg(bool $shared = false): string
     {
         $pkgconf_libs = shell()->execWithResult('pkg-config --libs --static rdkafka')[1];
         $pkgconf_libs = trim(implode('', $pkgconf_libs));