Patch [3.4/3.3] G++ eliminate use of conditional expressions as lvalues

[Joern Rennecke]

Patch fixes:

> 11 ISO C forbids use of conditional expressions as lvalues

`current_binding_level' contains a ?:, so it can't be used as an
lvalue.  I wrote a macro `set_current_binding_level' to use instead.
No real functional change.

I think that is overkill.  All you need to do is apply the
distributive law to the * and ?: operators:

#define current_binding_level                   \
  (*(cfun && cp_function_chain->bindings        \
     ? &cp_function_chain->bindings             \  
     : &scope_chain->bindings))

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