ant: Update to 1.9.3

Also, Ant no longer has a build-time dependency on a particular JDK.
It finds the JDK via $JAVA_HOME or $PATH (by looking up javac).  This
way, we don't need to have separate packages like apacheAntOpenJDK and
apacheAntOracleJDK.  It also seems reasonable: after all, installing
GNU Make doesn't give you a C compiler either.  It does mean that
instead of

  buildInputs = [ ant ];

you now need to write something like

  buildInputs = [ ant jdk ];

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