applied patch from Liam Stewart
applied patch from Liam Stewart

If one is trying to compile a JDBC 1 driver and junit.jar is in the
CLASSPATH, then the build fails as ant tries to build the JDBC 2 test
classes. This patch fixes this problem by excluding the jdbc 2 files
unless the jdk1.2+ property is set.

tivv/davepgjdbc,tivv/davepgjdbc