Bug#893268: libnanoxml2-java FTBFS with openjdk-9

[Adrian Bunk]

Source: libnanoxml2-java
Version: 2.2.3.dfsg-5
Severity: serious
Tags: buster sid

https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/libnanoxml2-java.html

...
   debian/rules override_dh_auto_build
make[1]: Entering directory '/build/1st/libnanoxml2-java-2.2.3.dfsg'
jh_build -o'-source 1.4 -nowarn' -N nanoxml-lite.jar Sources/Lite/
find Sources/Lite/ -name *.java -and -type f -print0 | xargs -s 512000 -0 /usr/lib/jvm/default-java/bin/javac -g -cp :debian/_jh_build.nanoxml-lite -d debian/_jh_build.nanoxml-lite -encoding ISO8859-1 -source 1.4 -nowarn
error: Source option 1.4 is no longer supported. Use 1.6 or later.
make[1]: *** [debian/rules:23: override_dh_auto_build] Error 123