build frankenphp and embed after shared extensions, make sure the linker doesn't drop libphp.a symbols that extensions need

src/SPC/command/BuildPHPCommand.php

@@ -211,12 +211,6 @@ class BuildPHPCommand extends BuildCommand
         // start to build
         $builder->buildPHP($rule);
 
-        // build dynamic extensions if needed
-        if (!empty($shared_extensions)) {
-            logger()->info('Building shared extensions ...');
-            $builder->buildSharedExts();
-        }
-
         $builder->testPHP($rule);
 
         // compile stopwatch :P