Fix CppTypePrinter use of Long and ULong

CppTypePrinter outputs C++ code, so the proper type to be written for
Long and ULong are "long" and "unsigned long", not "int" and "unsigned
int".

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@iki.fi>

src/Generator/Types/CppTypePrinter.cs

@@ -110,8 +110,8 @@ namespace CppSharp.Types
                 case PrimitiveType.UInt16: return "unsigned short";
                 case PrimitiveType.Int32: return "int";
                 case PrimitiveType.UInt32: return "unsigned int";
-                case PrimitiveType.Long: return "int";
-                case PrimitiveType.ULong: return "unsigned int";
+                case PrimitiveType.Long: return "long";
+                case PrimitiveType.ULong: return "unsigned long";
                 case PrimitiveType.Int64: return "long long";
                 case PrimitiveType.UInt64: return "unsigned long long";
                 case PrimitiveType.Float: return "float";