Fix Python 3.4 + MSVC issue with elaborated type specifier for enum (GH-3782)

Cython/Compiler/PyrexTypes.py

@@ -4049,7 +4049,7 @@ class CppScopedEnumType(CType):
                     self.cname
                 )
             else:
-                type_name = "enum %s" % self.cname
+                type_name = "__PYX_ENUM_CLASS_DECL %s" % self.cname
             type_name = public_decl(type_name, dll_linkage)
         return self.base_declaration_code(type_name, entity_code)
 

Cython/Compiler/Symtab.py

@@ -701,6 +701,9 @@ class Scope(object):
             type = PyrexTypes.c_anon_enum_type
         entry = self.declare_type(name, type, pos, cname = cname,
             visibility = visibility, api = api)
+        if scoped:
+            entry.utility_code = Code.UtilityCode.load_cached("EnumClassDecl", "CppSupport.cpp")
+            self.use_entry_utility_code(entry)
         entry.create_wrapper = create_wrapper
         entry.enum_values = []
 

Cython/Utility/CppSupport.cpp

@@ -67,3 +67,15 @@ auto __Pyx_pythran_to_python(T &&value) -> decltype(to_python(
 #else
   #define __PYX_STD_MOVE_IF_SUPPORTED(x) x
 #endif
+
+////////////// EnumClassDecl.proto //////////////////
+
+#if defined (_MSC_VER)
+  #if PY_VERSION_HEX >= 0x03040000 && PY_VERSION_HEX < 0x03050000
+    #define __PYX_ENUM_CLASS_DECL
+  #else
+    #define __PYX_ENUM_CLASS_DECL enum
+  #endif
+#else
+  #define __PYX_ENUM_CLASS_DECL enum
+#endif