Merged fix to suppress gcc3.4 warnings in make_void from main trunk to branch

[SVN r21504]

include/boost/lambda/detail/lambda_functor_base.hpp

@@ -315,7 +315,7 @@ public:
 
 
   template<class RET, CALL_TEMPLATE_ARGS> RET call(CALL_FORMAL_ARGS) const {
-    CALL_USE_ARGS;
+    return CALL_USE_ARGS;
   }
 
   template<class SigArgs> struct sig { typedef void type; };

include/boost/lambda/detail/ret.hpp

@@ -257,7 +257,7 @@ const_parameters(const lambda_functor<Arg>& lf)
 // the wrapped lambda functor is evaluated, but we just don't do anything
 // with the result.
 struct voidifier_action {
-  template<class Ret, class A> static Ret apply(A&) {}
+  template<class Ret, class A> static void apply(A&) {}
 };
 
 template<class Args> struct return_type_N<voidifier_action, Args> {