devel/dragon: update 1.4.1 -> 1.4.3

• add conflicts with multimedia/dragon
• New generated configure script with libtool-2.4.6
• Changed generated Java code to abstract class with abstract methods, which have been implemented by the parser action subclass. This seems to be a cleaner modeling

Submitted by: Bjoern Lemke <lemke@lemke-it.com>