More robust enum generation for C family languages in C code generator.

Author: tritao

src/Generator/Generators/C/CCodeGenerator.cs

@@ -144,8 +144,8 @@ public override bool VisitEnumDecl(Enumeration @enum)
             else
                 Write($"{enumKind} {enumName}");
 
-            if (Options.GeneratorKind == GeneratorKind.CPlusPlus ||
-                Options.GeneratorKind == GeneratorKind.CLI)
+            if (!(Options.GeneratorKind == GeneratorKind.C ||
+                  Options.GeneratorKind == GeneratorKind.ObjectiveC))
             {
                 var typeName = CTypePrinter.VisitPrimitiveType(
                     @enum.BuiltinType.Type, new TypeQualifiers());