Tweak Java Makefile.ams to fix "make distclean".

The Java Makefile.ams assume the existence of ANT, but "make distclean"
runs in the Java directories even if ENABLE_JAVA is off.  This change
makes the clean-local target handle the absence of ANT, fixing
"make distclean".


git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@665683 13f79535-47bb-0310-9956-ffa450edef68
2 files changed