drop suncc support from singleton class

include/mapnik/utils.hpp

@@ -84,36 +84,17 @@ public:
         static MaxAlign staticMemory;
         return new(&staticMemory) T;
     }
-#ifdef __SUNPRO_CC
-// Sun C++ Compiler doesn't handle `volatile` keyword same as GCC.
-    static void destroy(T* obj)
-#else
     static void destroy(volatile T* obj)
-#endif
     {
         obj->~T();
     }
 };
 
-#ifdef __GNUC__
+
 template <typename T,
           template <typename U> class CreatePolicy=CreateStatic> class MAPNIK_DECL singleton
 {
-#else
-    template <typename T,
-              template <typename U> class CreatePolicy=CreateStatic> class singleton
-    {
-#endif
-
-#ifdef __SUNPRO_CC
-/* Sun's C++ compiler will issue the following errors if CreatePolicy<T> is used:
-   Error: A class template name was expected instead of mapnik::CreatePolicy<mapnik::T>
-   Error: A "friend" declaration must specify a class or function.
-*/
-        friend class CreatePolicy;
-#else
     friend class CreatePolicy<T>;
-#endif
     static T* pInstance_;
     static bool destroyed_;
     singleton(const singleton &rhs);
@@ -132,6 +113,7 @@ template <typename T,
     }
 
 protected:
+
 #ifdef MAPNIK_THREADSAFE
         static mutex mutex_;
 #endif
@@ -163,6 +145,7 @@ template <typename T,
             return *pInstance_;
         }
 };
+
 #ifdef MAPNIK_THREADSAFE
     template <typename T,
               template <typename U> class CreatePolicy> mutex singleton<T,CreatePolicy>::mutex_;