build managed C api if managed is available

Author: timfel

mx.graalpython/mx_graalpython.py

@@ -1180,6 +1180,11 @@ def build(self):
         mx.ensure_dir_exists(cwd)
         rc = self.run(args, cwd=cwd)
         shutil.rmtree(cwd) # remove the temporary build files
+        # TODO: GR-18535
+        if mx.suite("sulong-managed", fatalIfMissing=False):
+            mx.ensure_dir_exists(cwd)
+            rc = self.run(["--llvm.managed"] + args, cwd=cwd)
+            shutil.rmtree(cwd) # remove the temporary build files
         return min(rc, 1)
 
     def src_dir(self):