Bug#893290: libsaxon-java FTBFS with openjdk-9

[Adrian Bunk]

Source: libsaxon-java
Version: 1:6.5.5-11
Severity: serious

https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/libsaxon-java.html

...
   debian/rules override_dh_auto_build
make[1]: Entering directory '/build/1st/libsaxon-java-6.5.5'
mkdir -p build build/api
/usr/lib/jvm/default-java/bin/javac -nowarn -source 1.5 -target 1.5 -sourcepath src -classpath /usr/share/java/jdom1.jar -d build `find src -name \*.java`
error: Source option 1.5 is no longer supported. Use 1.6 or later.
error: Target option 1.5 is no longer supported. Use 1.6 or later.
make[1]: *** [debian/rules:17: override_dh_auto_build] Error 2