Horrible fix for llvm 22.

Index: lily/include/smobs.hh
--- lily/include/smobs.hh.orig
+++ lily/include/smobs.hh
@@ -251,6 +251,7 @@ class Smob_base (private)
   // least, but in emergency situations one can always use a "rest"
   // argument and take it apart manually.
 
+public:
   template <SCM (Super::*pmf) (void)>
   static SCM smob_trampoline (SCM self)
   {
