Remove redundant version check

Author: jim-easterbrook

src/interface/xmp.i

@@ -67,8 +67,4 @@ DATA_CONTAINER(Exiv2::XmpData, Exiv2::Xmpdatum, Exiv2::XmpKey)
 %ignore Exiv2::XmpParser::decode;
 %ignore Exiv2::XmpParser::encode;
 
-#if EXIV2_VERSION_HEX >= 0x001b0000
 %include "exiv2/xmp_exiv2.hpp"
-#else
-%include "exiv2/xmp.hpp"
-#endif