less SFINAE noise on solaris

Author: romainfrancois

inst/include/Rcpp/platform/solaris.h

@@ -10,7 +10,9 @@ namespace traits{
 
   template <typename T> struct is_convertible< std::vector<T>, SEXP> : public false_type{} ;
   template <typename T> struct is_convertible< std::deque<T>, SEXP> : public false_type{} ;
-  template <typename T> struct is_convertible< std::map<T>, SEXP> : public false_type{} ;
+  
+  template <typename KEY, typename VALUE> 
+  struct is_convertible< std::map<KEY,VALUE>, SEXP> : public false_type{} ;
 
   template <> struct is_convertible<Range,SEXP> : public false_type{} ;